Multichoice false advertising (*******)

Multichoice ran a spin the wheel competition early this year, In March I win a free upgrade to premium to last for a moth and automatically be activated 26 April. I contacted them in April after I noticed my bill went upto R829 and due to be paid 26 May and I was told that I requested an upgrade, advised the consultant that I won the spinning competition and she/he congratulated me and advised that after a month will go back to my premium and the bill was now rectified, it was on - R5.33. May moth before the 26th which is my paying date the billing has now changed to R829 to be paid in June 26. Went to their inbox and consultant now said I should schedule a downgrade the package on the app, now the billing was on R539, the following day its sitting on R1368. What's going on at Multichoice? The lure the customers with competitions only to double bill them. If I wanted premium would have upgraded but this is ripping customers off, I won't be paying that amount.