Month to month data changed without my approval

On the 14th May I went to a cell C store to find the amount I would be charged in closing my contract cell phone contract for number ***.. I also have a data plan which I would like to close ***. As per my knowledge my data plan is on a month basis as I only have a sim and not a router. When I continued on this plan in 2020 I specifically requested that I do not want a contract. I was advised my your agent that this can not be terminated as I would need to pay R150 cell number ***...I would like to know the following

1. Why was I not consulted by call and a official email stating that there would be a new retention plan when calleling my month to month plan.

2 I recive different responses from your agent the store telling me that notification sent by SMS on the 1st of feb....how is this possible as I did not apply this via SMS??

3 please share proof of Email, phone calls advising that I approved the new plan on my data being that I agree on a contract and if I cancel I will be Charged R640

I would like Cell C to authorise my cancelation at no extra fee being that I know and understand that I would be charged 150 as my plan is on a month to monthly

I look forward to your urgent response in this matter

I was promised a call by a supervisor on the 16th which was not done and an email response within 48h

Regards Katleho Radebe