MTN. Disappointing!!!

Good day. I've been trying to get assistance from MTN regarding my account. I haven't received any help from them. I have taken out a 140G minutes per month data. (ZTE Router) with them. I only switched it on for day and a half and now it says my funds are depleted. I wanted to get an explanation and understanding of how that happened but I'm still in the dark. I tried to access them on 083135 and on their WhatsApp Customer line but that was not useful for me as it doesn't offer the option I was looking for. I then send them an email on *** and I got a response from a called Nokuthula. She wasn't able to help me. I guess she referred me to get colleague by the of Nonkululeko from whom I'm still awaiting response. It's very disappointing for such a big organisation to be so ***********. MTN must just assist me regarding this or I'm cancelling this contract with them.