Quick to harass you for money but very slow to refund the money they owe you

On Thursday 10 October I accidentally made a payment into Ampath's account that was meant for another company with a similar name, that was my mistake I admit that. When the other company called me on Saturday to ask were their payment was I realized my mistake. First thing on Monday morning I contacted Ampath to ask for a refund. I was email a refund form and copy of the proof of payment that I would have to email to ***, and my refund would be processed within 24 to 48 hours. I did this all before 10H30. On Wednesday October 16 I called the accounts department to follow up and my refund refund and it had never even been processed yet. I was lucky enough to get through to a very helpful lady in the accounts department that asked me to resend the documents to her and she called me back to let me know that she had sent it over to the banking department marked as urgent and still no refund. Funny when you owe Ampath money they call you a couple of times a day everyday but my phone blocked them as spam so I never took the call and then they started harassing my daughter. When I called them to ask what the problem was I was told that I had an outstanding bill but I never received the bill because they had the wrong email address for me. When I got the bill I paid it. Now that they owe me money it's a whole different story now I am the one phoning and phoning. It almost a week later and I have still not received my money back.