Refund quiry

This is the second time I’m writing about Nimble, I wrote in December and they made it as if they are going to fix the problem about my refund of which they did not. I called them last week trying to do the follow up and they still did not pay back my money. If it was them calling me they were going to charge me for the calls but now it is the other way around they are doing nothing. They asked me to send all my bank statements in December, I did and I was charged more than R100 by the bank but still they have not paid my money back.