Telkom Mobile no credit on debit

I ordered a new contract from telkom for a Mobile device all approved they said they will deduct R299 from my account to test my bank account and reimburse me my money back on the next invoice. i said perfect first invoice came R645.15 then i called to find out they said it was thier fault anf they will log a call for the money to be reimbursed. The Ref is ***8. This call was made in december 2019 i called again in jan they said they will escalate this issue i got my new bill for Feb R299 is my amount to pay and guess what no credit of R299. i wonder how many people Telkom getting away with people money that are not calling back. TELKOM WHERE IS MY R299