Samsung A71 5G Network Issues

Don't buy this A71 5G. I bought it in june 28, the same problems everyone is experiencing happened to me, so I contact the manager at the store, before the 14 days. He kept pushing saying is the 5G signal is new, give a few days, after the 14 days he said call customer service at 611, of course after 14 days you can't return or exchange the phone.  i did called, they told me to reset network, i did, then they gave me another A71 5G, same problems, full signal, but said not register on network, no network connections, switch to LTE 3g, nothing same thing, then is your location, my old phone Moto Z2 Force worked perfect and full bars, then is the sim card (was new but..) I switch the sim card, same problem. WiFi drop calls, drop calls with full signal bars.  Then one representative told me by july 13, that they knew about the connectivity problems with that particular phone. The solution they gave me was to sell the phone and buy another cellphone. Finally I talked to another tech at Tmobile and she said is a Samsung problem, I contacted the Samsung tech they told me the same things of Tmobile reset, sim card….and that is Tmobile problem. . I have in my desk a paperweight, looks beautiful, doesn't work but looks beautiful. $600 in the garbage, after 6 years with Tmobile. Tmobile knew about the problem, they trick everybody and told the salesperson to push the phone and to delay or exchange so the time to return can expire, after 14 days you can't exchange or do anything but wait until they fix or give back the money or exchange with another Samsung product. Help Tmobile please stop the BS