Fee Removal

I returned my Business Class modem to the local Comcast center in Yuba City, got a receipt for it; however I am still being billed an equipment fee. I spoke to an Comcast business services agent who assured me this bill would be removed and that I also would have no charges pending since I cancelled service within the first week of service. And I had explained how an installation was performed at my place of business without my consent, seeing as how I already had my own Cable modem & network equipment/ This is poor service, and aggravating considering that I still am receiving payment due emails indicating there is a bill when there shouldn't be one, considering I called business class customer service weeks ago to make sure the equipment fee was removed and I was told that it had been removed from my inactive account.