No Communication

My current bond is with Standard Bank and i never had issues with them untill last year. Every time theres an Interest rate hike they dont communicate to me what my new installment is. Standard bank use to email if theres any changes but they stopped since last year, and then what happens my bond goes into an arrears and then i get phone calls. My bond gets paid directly from my salary so if theres any changes i need to inform my payroll department. I dont know how the calculations work so i feel this should be there responsibilty to inform their customers that theres an increase in the interest rate and what the new installment is. I feel that i need to switch my bond to another bank because not only is it very imbarresing to receive these calls but the short payment also impacts my credit score. Ive requested that they email my a letter stating my new repayment amount so that i can forward this letter to my payroll for adjustment.