OnAir DSTV - Terrible Service

In about April 2019 I took out a 2 year contract with OnAir DSTV for a new Explorer decoder. After the contract ended inMay 2021 I noticed that the monthly debit order was still going through my account and then tried to contact OnAir. After getting no response from to my query sent on their link and afer numerous attempts to phone them, I eventually got through to a human who sent me a mail and a Paid up letter. On 2nd June I mailed them and requested a refund of the debit orders that had gone through my account after the paid up date. On 29 June I got a mail saying that the refund had been submitted and that I would be refunded within 7-14 days. On 22 July I queried them again and still got no reply. I then asked them for the contact details of their Managing Director on 10 August was told that a Team member would be in touch. They the said that a manager has tried to phone me but had had no responce. I has no missed calls so I know this was Bull. Still nothing happened. and more mails were sent again asking for their MD's contact details. Their response was that they didn't know who their MD was but a Manager would phone me. Over two months later I'm still waiting for a refund. Their Customer Service has been abismal and they have a "don't care" attitude. All my attempts to get to speak to senior management seem to be blocked.