Homeloan from FNB extra payments

I got a homeloan from FNB August 2018. Every month I make extra payments into the Homeloan and every month I have to phone them to deduct the extra payment from the capitol outstanding. I have other homeloans with other banks, and FNB is the only one in the dark ages. The only one you have to phone everytime you make a extra payment. Can't wait to pay this homeloan off and be done with FNB. I have also phoned them and asked them if there is a way for me to authorize them to automatically deduct the extra payments from the outstanding capitol and the answer was NO and was told that I'll have to phone them every month. And if there's one company you want to stay away from phoning and trying to speak to the right department or person, it's FNB.