Disappointed Customer

I'm so disappointed with Ackermans Customer Service, I paid 2142.72 on 27 March 2020 via EFT I used a correct account number and a correct reference number, up to date different consultants call me daily to ask me to make payment arrangement, I've sent Proof of Payment to the WhatsApp number and to *** still I'm not getting help, they are busy adding interest and not getting to the bottom of the matter, I thought the delay was because of lockdown but this is no longer fair, I regret using EFT.