MTN IS ****ing TRASH!

I have been a client at MTN for almost a decade, last year I took a contract for an IPhone 12 Pro Max valued at R 1500 inclusive of insurance, billing was going well until I took a second contract for my partner Iphone 13 valued at R930 per month, after 2 weeks I was billed R2726,59c I was under the impression it was prorata fees when I asked my sales consultant Linda Majola he told me that I shouldn’t have been billed for the second phone on that month,as billing was supposed to run the following month, so last month I was billed wrong, again this month for 2 phones I just got an invoice for R3076,78 ! Tell me where the hell you get these figures both contracts are on top up!!! I’ve escalated to customer service and zero ****ing service! To call a credit controller and be told “ I also don’t understand why are you being billed like that” what sort of ****ery is this can someone call me with a solution this is messing up my contract and no one available to explain,!can someone who knows what they are doing provide constructive feedback this is unacceptable! Service was way better when call centres were owned by your business!!! This service is ****ty! Or you make too much money you don’t care about your corporate consumer business anymore! I want my ****ing billing fixed asap!! This is not in my contract! I demand a ****ing resolution!!!!