Dissatisfied customer

I am a Price Lock customers with DStv - each month an amount of R948.00 gets debited from my account. In Oct 2019 an amount of R1206.43 - I queried this deduction several times (telephone calls & emails) to no avail, each time being told they will come back to me. On the 20 February 2020 I received a sms confirming that there will be no price increase for this year and contract fees will remain unchanged. Today 24 Feb 2020 I received a reminder that my deduction will R1053.00 - so of course I phoned to query this. I was told this is the amount that gets deducted. I was not particularly happy as I was told the amount for Price Lock is R899 per month (I have an additional decoder therefore the amount being R948.00 each month). I then asked why is an amount of R1053.00 being deducted to which I could not be given an answer. As far as I am concerned DStv is actually *****ing money from me as I have a 2 year contract which has not expired yet. I find this to be bad business ethics. I am sure I am not the only customer this being done too - but what frustrates me even more is that no reason can be given. Please can you assist with this query. My debit order date is the 27th of each month, so I know this is short notice, but I also know that I will not get a refund as per my previous experience.