MTN - Terrible service

Mtn has always been my preferred choice of service provider until recently.My mum who has taken a new contract with Mtn has been struggling with their customer care services for 6 months now.Email queries come back because subjects lines not according to the list provided by mtn however the list does not included complaint or accounts .You call wait for days with no feedback or feedback that dont make sense or refund .It left my mum and dad stranded with contact and cent-less with incorrect debits coming off their account by mtn and no refunds .It has also affected income as one contract is for bussiness use.She is still enquiring its been 6 months and we going around in circles