I had 2 phone lines with AT & T. In May of 2008, I changed one (2378) to another company, with unlimited long distance and cable internet, and use that one for calls. I kept the other line (9744) to use as a computer and fax dedicated line. The fax has no phone, and has been unused for several months.
The dial-up was also removed later. In June, ATT correctly billed 9744 at $13.40. In July, they billed $95.65. I called and challenged the charges, and discovered they were for calls made on the other phone (2378). I was told the porting might not have been completed, contact the other provider, and the billing will be correct the next month.
However, in July, the charges were over $200, and were drafted from my checking account. Again, the calls were ones made on the 2378 phone, and when I complained to my bank, they reversed the draft. I verified that the only device connected to the 9744 line was the dormant fax. (There was no physical way to make calls on the 9744 line.) I just got billed $374.87 for calls made on the 2378 line(in August), and a notice that the current month (October) has a bill for $134.
This is a nightmare! ATT is ripping me off, and I can't even understand how they can achieve this???(I'm a tech, and the inference of fraudulent deviant use of technology seriously frightens me... as well as stealing money needed to pay my bills.)