Official T-Mobile Connect Prepaid Discussion

Hi  I have a T-Mobile pre paid account. My account is active and paid for in full. For the last 3 days my phone has not been able to get service. The phone says either not registered or cannot connect to network. I have tried contacting help online but they say I must call in for help. Unfortunately I do not have a phone that works. Can you help me? I have a Galaxy S8.  I have tried a turning the phone on and off, resetting network settings and removing the SIM card. None which have helped. I would like to avoid going into a store if possible. Given our health emergency.