Incorrectly billed

I received my invoice A*** and notice on the 3rd page that I was billed for June 01 -June 30,this following an email to notify me that my account has been suspended.I had no internet connection on the 01st of June,but I get billed for it what a *******.No one in this day and age pays for a service and does not reap the benefits thereof.Also in November last year I requested that they cancel my account.My router has been paid for already the only thing they should bill me for is not the device but the data usage as my contract ended and followed a month to month billing process.From the date my contract ended up to now must be rectified as I should only be paying for data usage as mentioned earlier and please for heaven's sake close off this damn account.There are better service providers than Telkom out there.