T-Mobile account does not recognize phone number when linking phone number to account in setup

My T-Mobile account used to work and recognized my phone number with no issues.  Here is some background on how it got messed up: I canceled my service and took my phone number over to a different carrier in late November and then just a few days later I figured out the new carrier was crap so I immediately ported my number back to T-Mobile and got my service set back up. I was only off of T-Mobile for approximately 10 days. T-Mobile got my service back up and running no problem but my account now does not recognize the phone number that it used to recognize for a couple years with no problem.  So frustrating!  Calling in to tech support has not resolved this issue and based off other posts that I've read, that sound similar to mine, I don't know that going into the T-Mobile store to try and get it fixed will actually work.