Social Security issue

I have been trying to buy a new phone for 4 days and am unable to because the response is that my SSN is wrong.  3 trips to the store, multiple calls to Xfinty mobile,  CSA etc and I keep getting passed between low level agents who can't help and arn't able to transfer me to someone who can.  I have an incident ticket which doesn't appear to help.  I'm begining to think that the only way to upgrade my phone is to go to another carrier.

Thanks for any suggestions