Vodacom doesn't refund after debiting thousands!

I installed Fibre at the beginning of the year and was over debited on my account for months. I raised this and finally received a credit on my Vodacom account but was still out of pocket. I requested a refund in March into the account they debited and i have been calling, emailing jumping through all the hoops but still no money in my account! I followed up again today only to be told the SR number was closed. Come on Vodacom do the right thing here!