Switch Rebate Link Never Sent to Us/30 Days Has Expired

Anyone else have this occur...We switched from AT&T to Tmobile in February. The salesmen at our local store never submitted our rebates and was never explained that we would have to file for them via a link which we never received. I got a bill from AT&T for our mobile phones that Tmobile said they were paying off for us. We called customer service and they told us we would have to talk to the manager at the Russellville, Arkansas location. She will not talk to us and is "never in." We suddenly got the link for the rebate last week. It's PAST THE 30 DAYS! When I try to complete the form, at the end I receive an error that says my Tmobile account is not current. It is current, it's auto drafted from our checking account. I am very frustrated because AT&T is going to want their money!! Suggestions???