PLEASE READ URGENTLY

In mid 2022 I app**** for a contract, the cheapest one, for R400pm. I then later decided to stop working out and cancelled it literally the next month. So i paid my first months R400, and then my cancelation fee of R800 which included a "free" month (R400 month, R400 cancel). It was a struggle as I kept getting emails and calls about still owing them money AS IF I DIDN'T JUST PAY THEM. I have all the slips, all the statements, all the emails, the person on the phone told me specifically R800 so I know that amount isn't wrong And now i got this message:

"We have not received pmnt on your VIRGIN ACTIVE acc.Please make an immediate pmnt and set up a debit order.Ref: -------------.MBD tel ***"

(blurred my ref number)

And if i call that number it says on TrueCaller "****mers Active MBD".

So i immediately thought it was a **** or some ***** scheme. And then I googled around and many other people have the exact same issue as me.

WHAT can I do? Can anybody assist me because Virgin Active is about as useful as n rock.