AMPATH CALL CENTRE DELAY 10 minutes on the telephone waiting for answer

I have paid my full account owed in respect of my wife Petro by EFT. An e-mail was sent to your customer care e-mail. Yesterday I still received a letter of demand indicating its is overdue. Kindly acknowledge receipt of full payment directly to me by e-mail and remove any adverse credit rating with any applicable agency you subscribe to. It is now 25 minutes on your call line and no telephonists are avilable to take the call. You are a "bluecihip". Why can you not offer proper services to your clients?