Justfly Flight Training

If you think JustFly will help when you need help THINK AGAIN!
I am a new customer and I wanted to let everyone here know about my experience with JustFly. I can confidently say that this was the worst experience I have ever had with a travel agency.
A couple weeks ago I booked a flight through JustFly going from NYC to Moscow in November 2015 for ~$ 700. Online experience was great. I was able to process the purchase quickly. About a week before my flight I found out that I could no longer travel and had to cancel my flight. I called JustFly Customer service and asked if I could cancel my flight. Apparently there was no refund offer for cancellation (which is pretty common) and so I don’t lose all the money I decided to push my flight dates to April 2016.
I first called the airline directly (Aeroflot) and asked to change my ticket but they told me I had to go through JustFly since this is where I bought tickets in the first place (which is also very common). So I called JustFly again. There they told me that the penalty for changing flight date is $ 250 (which is unheard of but OK) + any difference in Airfare + new airfare CANNOT be cheaper than my original one. So there is no way I can find a cheaper tickets for April and pay the penalty from the difference in ticket price. Ok, I thought, this is their policy.
I asked Basty (their rep) to find me a flight in April that will cost the same as my original ticket so I don’t have to pay difference in airfare. I am googling a ticket now and it costs ~$ 600. Yet, yesterday when I asked Basty to find me a flight for these dates he said they would cost $ 20 more than my original flight (well, I didn’t have my computer in front of me yesterday so I believed him). When I asked him to book this flight he put me on hold and then said I couldn’t book this flight (airline policy) and could only go in the beginning of April and would still lose $ 20. By the way, this flight now also costs ~$ 600 (see screenshot) so I have no idea where he got that this flight was ~$ 720.
Finally after spending an hour with Basty he was finally able to process my changes. I just spent $ 270 to change dates and a few hours in total on the phone. Now, I am coming home and getting a phone call from Basty telling me that he just heard from airline that I have to pay $ 40 more for taxes. At this point I was frustrated beyond belief. I said that this is not what I agreed to with him and not what the terms were when he and I spoke, so I am not OK paying this difference. He said he would revert to my original flight if I don’t pay. I then asked him to connect me with his manager and instead of doing it he just continued to cancel my changes and changing my date to original. It took me maybe 6 – 7 times to tell him that I don’t approve of what he is doing and I need to speak to a manager when he finally connected me to his supervisor.
His supervisor talked to me and said he would connect with the airline to find out if they can waive additional fee and that he would call me back within an hour. Sure enough, he never called back.
I called them myself today and spent another hour on the phone just to bump into another rep who I had to explain the whole thing all over again. She also found a miscalculation and said I owed even more money. Honestly, I was not frustrated anymore. I felt defeated.
After having me on hold for 30 min Laura (another rep) told me she spoke to a supervisor and that they would charge me $ 298.16 and then will refund $ 28.16. So basically I just wasted hours of my time, all my emotional strength, fighting to get $ 28.16 and $ 270 penalty for a flight that cost $ 100 less than my original flight.
For the record, Aeroflot charges $ 50 for changing flights which means that JustFly makes $ 200 for each ticket exchange. Given this difference I’m wondering how on Earth you guys will get customers if you have such a poor customer service.
I am not dissatisfied or frustrated. I am defeated and will tell as many people as I can that they SHOULD NEVER use JustFly for ANY REASON.