Onair TV poor service

I had a 2 year contract for my 2 DSTV Explora's with Onair. My contract expired the end of May this year. They still kept on deducting money from my bank account. I send several emails and made several phone calls to Onair. They said they asked for a refund in July but up to now I have not received and refunds from Onair. Has any body else experienced problems with Onair?