contract canceling nightmare

After cancelling my contract, I was informed of a cancellation fee. I was subsequently contacted by Hybrid Collections, at which point I made a payment arrangement to clear the balance. Despite this arrangement, both companies proceeded to take unauthorized amounts from my account. I contacted Hybrid who informed me I need to contact Netstar directly, which I did. I was then informed by Netstar that they will process a refund and I will receive an email. I am still waiting for an email. My problem now is Hybrid keeps on contacting me stating I owe money when I paid R500 more than the actual amount owing. Since signing up with Netstar I've had endless problems. Their staff who know absently nothing about customer service is a story for another day.