No refund from Arena Holdings

I have paid a subscription fee on the 10th February 2021 and realised immediately that I have paid the wrong company. I phoned Arena immediately and asked for a cancellation. It was excepted and I received the following day, 11th although it was promised for the 10th, an email confirming it. They have requested proof of payment and proof of my banking details for refund. This was submitted on the 11th. On the 12th I received an invoice showing my payment less R35-00 as a credit. The 17th I still have not received my refund, although less then what I have paid. It was confirmed by them that the refund was in processing. Emails since they do not even reply to my emails.

Pathetic service and then a reduction of R35 on my payment, for what?