Standard Bank no service

24 October 2019 logged a call with Standard Bank to refund money from online purchase which was not the correct value, and 2 transaction went thru for same amount 2 x R 777,20 which should have been 1 x R 92.00 logged the call same day as transaction. Went to bank next day filled in paperwork for them to investigate. Received sms deadline for them to finish 6 Dec 2019, Received email from Standard Bank stating the following(Note that we have credited your account temporarily while we investigate the disputed transaction(s). If we get information from the merchant's bank confirming that the disputed transaction(s) is genuine, the credit on your account will be reversed and we will send you copies of documents supporting the transaction. If you have any questions, please email us at ***)which this never happened. I then called and they say give them til end date which i did. and that is where the fun started. Phone their *** number wait to speak to someone do verification that am i who i say i am,done get ref for call and get told wait 48 hrs for refund. Do that and 48 hrs later no joy go thru same process again get told by the person on phone they are going to speak to team leader and contact me once done, out of the 8 calls to them this never happened once never phoned me back once,no sms, no email, just no update. Spoke to them again today and went thru the whole story again wait and hold to get told they will come back to me well lets see that still have no phoned back. and no money back into my account either. I have 4 ref numbers for escalation on matter still no luck.