Still awaiting refund- over 4K 9 year customer -FED UP

This is my second hello Peter...I’ve been with mtn for about 9years now I’ve taken out multiple contracts with them to date I have 5 contracts...they’ve been overcharging me for the past 3months now...I’ve requested a cash refund I spoke to Ayanda from Mtn Brooklyn told me it would be processed by 1june I call him and no answer no feedback NOTHING!!! I’ve been dealing with Siyabonga mtn Menlyn I told him I want my money back I don’t want a credit I want a refund for the full +-4000 they owe me...I’m still awaiting yesterday he advised that it still hasn’t been processed...I won’t be taking out any other contracts with them if I don’t get the money back that they’ve been *****ING/ROBBING from me. I’ve had to make provision for the difference of those funds and it’s been a huge inconvenience to get my contracts rectified...I WANT MY MONEY!!!!