Poor service

I used to pay the premium at fnb at the tellers ,until the credit card expired in 2015. And I never received any correspondence from discovery what alternative month of payment I could use.until I call their customer care in 2020 .and the service rep gave an account number and I have been paying every month ever since then.i even send the proof of payments. Only to find the account number their service rep gave me was wrong.i made several attempt to get to the bottom of this and discovery is not assisting .they making my life a leaving hell