OPTICOM - ZPDI RIPOFF I am not going to pay for the services I never received. Nationwide

Feb. 2005 I received a bill from QWEST in wich they tried to charge $52.32 on behalf of OPTICOM/ZPDI. I emailed the latter Co. that I am not going to pay for the services I never received. But despite several written promises to credit (see a sample below), the company continues its attempts to get the money from me
----- Original Message -----
From: "Shelby Morris"
To:
Sent: Thursday, April 28, 2005 6:41 AM
Subject: Re: [Fwd: Re: ZPDI Billing Inquiry: 2063680123 OPTICOM DR]
Mr G.,

Thank you for your inquiry. Your account has been reviewed and a credit in the amount of $46.80 was issued on 4/8/005. Please allow at least 2 billing cycles for this adjustment to appear on your bill.

In the email Ms. Calvert sent, notifies you that she had already issued credit to your account and that it takes _2 billing cycles_ to appear on your bill.

Thank you,
Shelby Morris
Opticom Billing Inquiry

Michael
Seattle, Washington
U.S.A.