Bad service

I paid my pep account from pep internet link on how to pay your account, payment was made on 04 January 2023, but I've been getting calls that I have not paid my account. I emailed my statement but got bad service from ncumisam who insisted that I tell him the account number that I paid into, how on earth will I know the account number that pep or Tenacity decided to use for their internet EFT? She then said I must go to the bank the bank will provide proof of payment, still this is not possible because I didn't register them on my internet banking🥺. I emailed my statement still didn't get help, can't they go into the statement to check my payment against my statement. February I paid in person at Pep Village mall Hartebeest still they saying I didn't pay. And at the same time you guys are messing up my credit record and falling to do your job and check my payments. Very bad service