My bill at Mtn has *****ulent subscription charges and i have not subscribe to any services

i have been with Mtn for 7 years, i got a contract for home internet last year and i have been paying R295 pm without fail, i got a shock when i received my statement for December as it came to R2614, i made a call to their billing department and they told its sum subscription service over 40 of them charging me R4 a day, i told them my spent limit is R0 why do i have those services on a router sim card and why only now those service are being added to my account, Mtn is de*****ing their customers and i will be closing all accounts with them, our information is not safe at Mtn, how is it possible to subscribe to those service when your sim card is always in the router