Unable to activate cell service

My wife's service was suspended because I was unable to deposit money into her account in time and now I've done the payment and its still suspended. I went to the store and they told me its not suspended anymore on their system payment went through and there is nothing they can do to help me. MTN advises you call 135 but you can't speak to an operator and you need to use the app which won't send me an otp to register. I understand its difficult times but someone needs to be available to help with things like this or they should be able to do it in store