Complain about Mtn service

I have a contract with Mtn it's R89 data contract 4G data 2G daily and 2G midnight, my complain is the daily 2G runs out fast and ever since i upgraded last year May to this data contract i used to forfeiting 2G midnight then i called 135 no i talk to the call center agent last month to query about this, so now i'm trying to use the 2G midnight it worked only for 2 weeks after recieving data on the 12-11-2020 , and there's still a lot of midnight data 1.20G left i'm trying to use them at 4 am-5 am i open data but Mtn instead of taking data from midnight they are taking the one that i top up with that's what happened also today. I also bought a R15 airtime it's just vanished the very same time after loading when i called the person i talk told about subscription that i don't know. In all i'm not happy cause i called Mtn and talk to different people but i dont get help