Telkom incorrect payment

Hi I wrongly paid my monthly installment on the incorrect account number....what happened I went to telkom branch that is in Benoni Lakeside Mall next to Spur to ask for my account so that I can pay the instalment the lady gave me the incorrect acc of which I paid the instalment on it..now am asking for the refund they keep on telling me it's been reported since last year i am calling them the only thing I could hear is that we will escalate this matter ..Everytime..I don't know how do they work??am so dissapointed ..I sent all the proofs to them but nothing is happening