Subscription charge wrong contract no ***

Contract start 5 nov 2015.subscription of R399 per month as per contract.cell c charge for 5 nov to 30 nov R721.46 and for 1 dec to 31 dec R832.35 and for 1 nov to 30 nov R482.45 for a post paid data,get the R482.45 as discount.for the 2 months the subscription cell c charge is R1553.91,all amounts excl vat.charges are only for subscription.limit of R50 for use.contract number is ***.PLEASE WITH IMEDIATE EFFECT CANCEL CONTRACT.WITH NO FURTHER COST TO ME.this is contact breach,copy of contract is available where stated subscription is R399 per month for 24 months on smartdata 20gb.please reply or further steps will be taken.<br>