Utterly disgusted by the level of incompetence of this Network provider

I would like to express my dissatisfaction with the service I've received from MTN so far. I have given them ample time to try and sort this query out internally but I have had no joy from them. I've been following up from April and have been sent from pillar to post each time.

I have two Data contracts with them and On the 25th April 2020, I received a message from my Bank with debit notification of R1 417.52.

My Invoices for April amount to R596.29 both contracts.

Now I called your "Service Champions" with Ref: *** and was referred to March Invoice with R839.56 'Extra Usage"

According to my contract with MTN, I have a 20G "Capped data" contract, and soon as that Data is finished "I will automatically be disconnected or the message of Data being depleted is communicated.

Now I am puzzled to be told I used extra Data in March amounting to R839.56,

Keeping in mind my Data is loaded on 11/12 each month, and by 30th I was left with 68kb I could not use, and I bought 3Gig data for my Cell C number costing me R249.00.

I have proof of purchase of the Cell C Data on the 31st March,

My question is when was this Data loaded and how many Gigs was loaded, or a spreadsheet pointing me to that amount/data. Please each of the call reference numbers I got each time I called to query this:

First was an acknowledgement of my email above on ref no: *** second *** Agent name (Krishnaveni Kanniah) Third reference: *** Fourth reference: *** Even engaged them on twitter on the 12th of June 2020

I was told that they are investigating from March to date can you please resolve this ASAP as I cannot have this hanging over my head any longer