Home loans - Bad Service

Very disappointed, I have a new home loan with Standard bank. Standard bank offered me a discount on my interest rate if I open an account and the bond payment be transacted on that account of which I did but instead of the premium reducing from the discount given the monthly payment has increased and on top of that they have not been debiting the monthly payment for October and November and I don't know why but they are charging me interest for those non debits. Beginning of Dec I ended up depositing the money into standard bank because I do not want a bad credit and every time I call customer service they tell me they will get back to me and when I send emails, there is no response.