6 months ago I switched local and long distance to one carrier (Verizon). I am still getting bills from AT&T. Verizon tells me that according to their switch all numbers are through them. AT&T tells me that they can't tell me anything other than Verizon sends them the info to bill for. Is it possible that there is a code programmed into our system, if so how do I find it and get rid of it.