Breach of Price Lock Contract

I have been trying since early October to rectify the issues with my price lock plan with dstv and to date still they have yet to figure out whats going on. I keep getting told that my account is being escalated to the relevant department and response time is 2 to 48hrs and now its almost over 2 months. They keep debiting the incorrect amount and that ends up with my other debits being offset and of course the additional bank charges i incur . They also have informed me that the price lock plan I have which was R949 has now been increased to R959 with no notifications to me but more pecu**** is that how can a price lock for 24 months be changed when they feel like it , I am sure that is a definite breach of contract. I am tired of calling the call center and also going on the live chat on my app trying to resolve this. I need this sorted before my next debit or I think I need to get some legal advice to take this further and finally resolve this.