Different number

Yesterday on the 6th of September I called the call center to apply for a credit card. I was then told it has been approved and I need to send my documents to *** of which I did on the same day as requested. Then today on the 7th I am told that the number that is on the Transunion is different from the one I have been provided to them and I have to call Transunion to check, of which I did then I was told that it's still the same haven't changed. They even sent me proof of my report, now I have to wait 7 days before I get a reply or response from them. The service is appoling and really not professional at all. This is very disappointing