Poor service

I have been a customer of MTN for many years. since 2011 have used roaming as I live abroad. Suddenly, my roaming has been removed without warning. urgently need to transfer money and cannot receive the required OTP from my bank because I am not on roaming. There is no contact number to phone from abroad. The emails come back without an apology or reason, telling me I have been placed back on roaming and have to to wait 24 hours! Very poor service.