MTN 4.20 am is not business hours

SMS messages at 4.20 am on a Saturday or any other day are totally unacceptable. any Messaging after 9pm and before 9am by a company is totally unacceptable. I have a pay as you go number as an emergency phone. I do not need middle of the night messages to tell me of a 24 hour special on phoning other mtn numbers. Plus this same number from mtn has sent me many messages with an opt in request. I have not ever opted in. So this means I have opted out. Why do I still get the messages? I will be dumping this card and opting for a different service provider. You don’t respect your clients.