Waiting form 8th July for refund!

After my cell c sim was cancelled, contract cancelled, cell c promised me they will refund me for the 2 months they deducted money from my bank account, me not even using the sim. I spoke to a Moses Mo***eng on the 8 th of July, asking my banking details, will refund me in the next 3 to 5 working days. today its the 29th of july. Still nothing!! Email respond to me: \The refund has been escalated to the finance department and once confirmation is available I will let you know". July the 18th. How long should I wait for a small refund amount???"""