Terrible Customer Service from MTN

I've just had a very unpleasant service from an MTN customer care consultant this morning at 09:00. I dialled the number 808 to follow up on a request for an itemised billing after requesting one two weeks ago for January 2018. I then received one for April and May which I never requested for. When I followed up the customer care lady was so rude to me and didn't want to give me clear information regarding a way forward after I've received the incorrect itemised billing. I asked her is I will be charged again for MTN's error and she asked me to hold while she wanted to find out if I will be charged or not. I held on for 30 minutes and she never even came back to me to give me feedback, the next thing she does is hang up on me without completing my query. I've been a loyal MTN customer for many year and never have I received the kind of service I've received this morning. My contract is coming to an end in August and I'm not even considering renewing it after the service I've received this morning. My query still has not been resolved and I'm very unhappy.