Vodacom refuses to refund me after they made a mistake

In December 2018 I wrote a review about the absolute disgusting service from vodacom who sent me a laptop and router because I'm a loyal customer and then without my permission opened a new contract in my name. It's been since October 2018 that I have been trying to sort this out. I was told by numerous people that I will be refunded for the mistake into my bank account. Now they put a credit on my account. This is rediculous. I asked to be refunded and was told they will. The last person I spoke to last week was Hope. I really don't know what to do anymore. They clearly don't care about their customers and the little people.