R1 deducted from my account every time I recharge

Hello Peter I am very disappointed to MTT Customer service and the whole team. For the last four months I have been recharging my phone and every time I recharge R1 is deducted from my account. I phone MTN regarding this matter and I will not get any assisted actually they will tell me that they can’t tell from their side what is happening to my airtime. On the 6th of June I purchased R10 airtime and same thing happen again. I phoned MTN customer service the guy I speaking to advised me to dial *135*6# to block out of bundle data. I did that and it was a success. Yesterday I purchased R10 airtime to buy 100min for 7 days, but my transaction was unsuccessful due to insufficient funds. I phone MTN customer service again last night to report the matter I was told that I need to phone to phone after 2 hours so that they can check for me. This morning between 11:30 to 11:48 am. I phoned MTN customer service to follow up, the first lady that was speaking to was very rude in fact she hanged up on me while I was speaking to her. Because I was asking to speak to her supervisor and I was asking what is happening to my R1 airtime. She said to me it might be used by the apps in my phone, I told her that the phone I am using is not the smart phone it is Nokia 105 model. I am very disappointed in her behavior, unfortunate I will have to escalate the matter. I would love to request for all calls recording from MTN from February this year to today calls. This is totally out of control definitely MTN is committing crime, because my mother is experiencing the same thing. There is amount being deducted from her phone.