CARD DEACTIVATED, UNABLE TO USE ACCOUNT

Opened my account on the 26 May, worst decision i could have made. I have been unable to make online purchases since this account has been opened because I am not receiving OTP's on my phone I have called numerous times and getting no help. To make matters worse, I stopped at a petrol station to pour diesel and when I had to pay my card DECLINED and i got an sms from STD BANK that my card has been DEACTIVATED for the transaction, imagine the embarrassment of being stuck because you have not paid your bill . MY LIFE IS AT A STANDSTILL AS I CANNOT USE THIS ACCOUNT when i need it the most, i am forced to physically go to stores for purchases and now I can't even use it to swipe because it's DEACTIVATED. I AM STUCK!!