Data Contract Cancellation

I have signed up for the MRP Mobile data package contract telephonically on Tuesday 05 September 2023. During this call, I was told that I have the next 5 days to cancel, should I wish to. If I cancel thereafter, penalties would be involved. I have decided to cancel 3 days later (Friday 08 September 2023) - I was then told that I will lose my mobile number, that it will be inactive for 3 days and I would need to go to my mobile network provider to perform a SIM swap. If this had been disclosed to me at the start, I would never have undertaken this deal.

My store account has been debited twice, I am not aware of this reason. I will have to report this matter to the NCA as I am within my rights: 2. Consumers have the right to cancel agreements within the cooling-off period, without providing reasons or incurring penalties for doing so. 3. Suppliers are required to return payments received from consumers, within 15 business days of receiving the cancellation notice