Rain is a ****

I subscribed with Rain December 2021 on the 16th and paid a pro-rata amount of R160 to get my internet connection, they then started deducted a monthly premium of R499 as of 31st December, November 2022 on the 22nd I called Rain to cancel my subscription as I no longer needed it, I was informed that on the last day of the month I will get an sms to confirm collection of their router and I was assured that the premiums have been stopped effectively immediately but to my surprise I was debited on the 25th of November 2022,i called Rain to enquire, they explained some story which still doesn't make sense, because it was explained to me that the premiums are collected in advance but they told me that was not the case and they refused to refund my money back, today 23 December 2022 a debit order went off from my account from Rain again and I called them immediately, again they are refusing to refund my money, they are giving me the same story that the premium is for the previous month which doesn't make sense, I also asked them to send me a statement proving what they are saying, my connection was for 11 months, therefore 11 premiums should appear on the statement anything extra should be refunded back to me, they said I must refer back to my rain app and check my statements from there and the statements appearing there correlate with what I'm saying, my bank is also refusing to assist me, they say I should resolve the issue with Rain as this does not appear as a normal debit order but a subscription, Rain keeps saying my premiums have been canceled but keep debiting my account.