CAN NOT RECEIVE OTP FOR INTERNET BANKING

This is the second time this is happening where my OTP preference was changed to SMS. Since I do a lot of cross border work this leaves me stranded unable to carry out any internet banking. The first time I had to wait 5 weeks before returning to fix it in person since I was not allowed to do so over the phone even though it was their fault. Now I find this has happened again and it is unacceptable since I urgently need to make a payment within this week or the next. I cannot afford to make an international call to a call centre who will keep me on the line for ages and like the last time will just tell me there's nothing they can do and that I just need to come in to fix it which I cannot do since I will be in this country for another 7 weeks. Changing my information without my consent is worrying as it does not make me feel secure at all since anything can then be changed and to feel this way with your own bank is reason enough to bank elsewhere. This needs to be sorted out ASAP or the minute I get back I am changing banks something I would rather avoid doing but this is just unprofessional. The only way of reaching me will be by making an international call to +***5.