INCORECT BILL

I HAVE A TELKOM CONTRACT WICH I TOOK VIA TELKOM, 23/08/2021 I PAID R135 WHICH I WAS INSTRCUTED BY THEM AS I MISSED 1 INSTALMENT AND EMAILED PROOF, 27/08/2021 I WAS DOUBLE DEBITED R270 AND NO ONE ASSITED ON MONDO WHATSAP LINE WHERE I SENT MY PROF OF PAYMENT AND VIA EMAIL. I CALLED TELKOM BILING DEPARTMENT NOW AND IM TOLD MY INSTALMENT IS NOT R135 IT IS R270 AND I SHOULD CALL SALES TO DOWNGRADE I DONT KNOW WHO UPGRADED ME WITHOUT MY KNOWLEDGE.... NO ONE IS ASSISTING ME AND MY SIMCARD IS SUSPENED BUT I SHOULD HAVE A CREDIT