POOR SERVICE AND INCORRECT DEBIT NOT RESOLVED IN 5 MONTHS!

I have had a pricelock offer for the last two years, last year in September they debited me. instead of the R959 they should be debiting they took R 1184.90 ! After NUMEROUS inquiries since September last year and promises made by a number of people they have still not corrected same, either refund me the difference or take it off the next months debit. the issue was allegedly as a result of their change of systems : not my problem, why must i chase you to do the right thing??