Really unsatisfied with the service i got while applying for a credit card

Really unsatisfied with the service i got while applying for a credit card. I app**** and submitted the documents as required, was asked for an additional document to explain hourly rate differences, this letter was submitted on the 14th of december. i received a notification to say application declined, so i called to inquire about why it was declined.

i was told the letters i submitted was not received, however i called yesterday afternoon specifically to confirm that the letter was received and when i can expect an outcome. i was told the letter was received and can expect outcome in 48-72 hours.

now im told the document was never received so the application was declined, and i need to apply again for a credit card. i dont want to apply again because it affects my credit profile. i was also told i need to wait 3 months before applying again.

I dont owe anything on my current credit card which i want to close as soon as ive been approved at discovery, my credit profile is very good and i can more than afford to get a credit card with discovery.