Unhappy new home loan client

Can someone at Nedbank find out why the amount being deducted for my home loan installment is different every month? Literally 4 different amounts in the 4 frustrating months I've been with you. I have already been forced to take unpaid time off work, trying to sort this out at a branch (Montana, Pretoria) after I failed to get any assistance over the phone. I really don't want to have to go through that again just to be told something I could have been told over the phone . Please also let me know how to go about cancelling Nedlife insurance policy. One more thing, this is the fourth month of deductions and I still have not received a statement of my homeloan account, so maybe you can make THAT happen. And PLEASE I BEG!! DO NOT refer me to any of your call centre numbers!!! The thought that this is only month 4 of 240 is very depressing...