Awaiting refund for over 1 month

I've been waiting on Ackermans (Tenacity Financial services) to issue a refund to me for over 1 month now. Ackermans collections team contacted me for payment but not advising me that I'm actually due a refund, I only learned of this when I called to follow up on my statements. I over paid by R713.00 and it's been a back and forth situation since. I've emailed them the necessary documents they requested eg. Proof of payment, ID etc and I keep getting passed from pillar to post when I call their customer service line. I've been promised the manager would call me back but that had not materialized, been into the store only to be put through to the customer service line again. Absolutely ridiculous! What I fail to understand is, why was I contacted to pay an amount when it wasn't even due? I never received statements but was told to pay. I have since asked for this account to be closed as I don't need to deal with an organization that does not honour their promises. All that I need is my money to be refunded and no, I don't want it to be credited to my store account because I will not spend another cent at this store. I can't seem to fathom how I'm now in this position of chasing my refund when it's no fault of my own. Just pay back what belongs to me and let it be the end to this debacle. From my experience, I will advise anyone to please demand a full statement before making payments to this organization because they lack communication between departments.