It's a known problem for talk. It can't overlap. 15/15 means it's new today. The prior ones will have expired sometime yesterday depending on when exactly you bought them. Then 12 hours later they will drop off the list.
You could try a restart of the phone to see if it might start working. Otherwise you'll need support to fix the confusion.
Roaming add-on re-buys are tricky as of current knowledge. So the roaming was working before? Did you see the previous one(s) go to 0/15 days? Or even see them disappear?
The known problem is that doubled-up talk makes talk not work properly. It's much harder to escape it now with the fewer choices and the cost. There's a method of buying a different one but if you only bought talk/text then the workaround of buying the other more expensive one becomes expensive. This method needs to wait for the previous one to go to 0/15.
@bridgemate1 due to the shutdown of 3G network in US and the PM has not enabled VoLTE yet, we are relying on T-Mobile 2G network for voice. Data and text are fine as they are can use Tmobile 4G/LTE network.
The T-Mobile 2G network is a hit or miss. Which city and state you are at? You might have better luck at different part of the city. For now, download VoIP app like TextNow to make and receive calls as a workaround. You will assigned another 10 digits number and people can reach you like a regular phone, excpet you pick up the call using the app
@bridgemate1 - Try restarting your phone.
Did you already had the same roaming addon on your account that still had time left on it? If so, you may need CSA to help you sort that out.
Public Mobile Representatives customer support agents (CSA) can be contacted by either two methods, found here:
OR, was it a different roaming addon added.