Contract with no device received

I app**** for a home router last year December, it was approved. I received a delivery of sim card only after a few days i called to find out where is the router, the consultant told me that the lady who was helping did not order home router and informed that the sim card will not work with he home router, i then asked the consultant to cancel the contract since it was within 7 days of the sim card delivery. To date the contract has not been cancelled, they are busy deducting my kids money for something that i do not have and do not use. I must reverse their payment every month with charged. this is really unfair and frustrating. I am not getting any help. MTN is a **** and this is not the first time i experienced this. they once opened 2 contracts with my name and took 2 expensive phone. i would advise south African not to use MTN it is very problematic.