Disappointed and Leaving MTN

I have been an MTN customer for many years. I have taken out 3 different lines in the past and managed to pay on time each time and where I couldn’t, I would inform MTN in advance and still manage to settle my balances. Last month (November) I missed a debit order as I was out of the country and had issues transferring to my accounts. I even had other issues with my bank which prevented me from paying. I literally missed one month’s payment. MTN never called nor gave me any kind of notice but only sent texts and suspended my outgoing devices abruptly. I have been trying to get hold of MTN for the past 3 days to no avail and now I keep getting texts of full suspension and threats of legal action over one missed payment which I couldn’t even negotiate because one can’t get through to MTN. Whatever the case may be I dont believe this is the way to treat loyal customers. Even ito the CPA and NCA- I don’t think due process is being followed. I was considering upgrading my line at the end of my contract which is in February but after careful consideration, I will be happy to take my money to another network that knows how to treat and engage with loyal customers.