Pay a year in advance and get handed over!

We pay mother in law's ,Mrs JM Vosloo , Premium subscription annually to take advantage of the discount, customer number ********** 3, R 8679.00 was paid in full on 1st June 2017. Today your debt collection bureau phones to say that R 1007.83 is overdue. After discussion this turns out to be for the access fee (HD 2 PVR, not Explora) which was never indicated in the past and was not reflected on the statement - the October 8 2017 Statement shows R1007.83 as not yet due! Why hand over to a bureau in the first place without notifying us about the overdue? Why don't you inform us about the access fee? Why do we bother to pay a year in advance? And how dare you hand over a loyal, paid up customer.?If DSTV wasn't my 83 year old mother in law's only means of entertainment you would have lost another customer a long time ago. A public apology is in order - even if you are an uncaring monopoly trying to make up for eroding market share.