T-Mobile

I came to this small T-​Mobile store (operated and owned by CellularPlus) after the larger one at 1252 St. Nicholas Ave. wasn’t able to help me. My SIM card stopped working this morning, and after consulting T-​Mobile Customer Service online I was told that I needed a new one (keep in mind that my SIM card was so old that it had «Voicestream“written on it, i.e. it preceded the actual birth of T-​Mobile…).
Mr Engrin Gomez was nice and helpful, activated the new SIM card ($ 20…) right away, and tried to sell me a different plan without being pushy (I didn’t need a different plan).
I have two complains:
1) The SIM card has no warranty; if it breaks next week I have to buy a new one and drop another Jackson. Also, $ 20 for a SIM card is rather steep.
2) When I asked for a receipt I was told that the piece of plastic that contained the SIM card was the actual receipt… Sure this is OK with IRS?