******** billing and pathetic service

What a pathetic service I've been receiving from mtn since the day the wrongfully upgrade my phone without my consent on the 22/05/2019 to a Huawei p30 on my mtn made for me M which was R369. I had to wait a whole month for this upgrade to be cancelled finally on the 13/06/2019 by Jennifer, now Mtn is coming up with stories insisting I pay R369 which is for the upgrade I didn’t receive. I spoke to Jennifer one of the complaint department agents who insisted I will not be paying for the upgrade and I requested to be taken back to my previous mtn package Mtn choice+S . on the month of June I never received any benefits from Mtn as I couldn’t use my line for 3 weeks due to Mtn’s technical department blocking my line. I received invoice to pay R290.12 for May which I paid. June I received no benefits so I’m surprised how can I be told to pay the R369 . I will not be paying for an upgrade I never received as well as benefits I never had. Why is it I’m being billed for two separated packages on 1 line. Now I’m being threatened my line will be suspended yet again whereas this is all Mtn's fault. I want this sorted out ASAP as it totally unacceptable for Mtn to want me to pay for something I never received. I want to cancel my line with Mtn as the service u providing now is just pathetic in so many ways and is getting worse and worse as every month it’s a different issue I experience with Mtn