MTN Disgusting service

My mother of 86 years old has had her phone suspended every two weeks due to non payment, she has paid her account religiously ever month, I have the following payments 3/3 - R407, 31/3 - R410, 2/5 - R410. 6/5 - R361, I tried calling the call centre but only get options and never get to speak to a consultant, I emailed numerous emails from 6th April to 18th May and the situation still has not been sorted out, I have reference numbers of ***, ***, ***, ***, I havnt had feedback on any of these references. I got into contact with Ntsudzuluseni Muthewane via email and he asked me to send proof of payment, which I did, he then came back to me saying he needed a letter from my Mom to give permission for me to work on my Moms behalf, I sent the letter, her ID, my ID as well as her bank statement where the payments had been debited as well as a payment notification we received from the bank regarding the payment, giving a bank reference number, this was all sent to Ntsudzuluseni. Nothing has been resolved, you can't deal with one person to help you sort out where the missing payment is, I was told by Ntsudzuluseni that he had escalated my query to the bankers, I have still had no feedback and my Moms phone gets suspended sometimes every week sometimes they kind enough to leave it for 2 weeks. The customer service is non existant, why give reference numbers when they not solved, My first email was 6/4 and my last being18/5. Who do you go to to get this situation sorted, my Mom is 86 years old and lives on her own during these trying times and needs her phone. She has paid her account timeously and the proof has been given to MTN so why does her phone keep getting suspended? Someone is not doing their job or just couldn't be bothered to get feedback to you. Why give out reference numbers when the problem never gets solved. My Moms phone has been cut possibly 5 times in the past two months yet she has paid and I have the proof of which I have sent through to customer serves 3 Times! So humour me now, am I going to get a response from this or ask yet again to send pop or asked again to call customer services of which I refuse to call again, waste of time, speak to different agents every time, get given a reference and you never hear a word from them again.