Paying for data I am not getting and cannot get any help to fix it.

I cannot believe how useless MTN has become, you just cannot get help. I upgraded my data contract to 5gig during the day and 10gig at night. MTN has made my contract 5gig during the day and 5gig night. I have contacted Tebogo, Linda, Kabelo, Ntomtandazo, Mary and Mema at Customer Support. I have spoken to Gugu, Pumla and Nqobile at head office. I have been to 2 MTN stores I have sent MTN copies of the contract twice and logged countless tickets only to be told each time that the issue has been resolved. I have been communicating with Angela Manne and Nqobile Zungu via email, but they are now ignoring my emails. Last night I checked the data balances and when the night limit hit 5gig it started using the day balance at 2:05 in the morning. I cannot get to speak to a manager, all of the staff I have spoken to are unable to help and I have spent more than 9 hours trying to get MTN to do something that should be an everyday task for them. It seems only when you have to pay them are they able and or willing to do something. I am completely disgusted and if this message on Hellopeter doesn't help I will be forced to leave MTN because I cannot get any assistance from any channel at MTN and you cannot reach anyone who is interested in customer service.