If you want to get this fixed, you should call their number and get a technician dispatched. He can put a test set on your line at the demarc outside your house

If you want to get this fixed, you should call their number and get a technician dispatched. He can put a test set on your line at the demarc outside your house. If the SnR is bad, or someone did something dumb like put a bridge tap on your loop, he'll know. If you want to prove that ATT sucks, congrats. Mission accomplished. Problem is, we already knew that. Go ahead and move ISPs. Don't be all that alarmed when the lawn guy cuts the cable vision line that Your cable provider buried the whopping 3" below the soil, as required by their policies. Don't be alarmed when their front line support requires you to restart your modem. Don't be alarmed when the experience still isn't what you expect as a network engineer. Front line support sucks because it's designed to handle calls from people who really do need to be instructed to reboot their modem. If you want effective support, you have to recognize that you are the exception to the rule, not the standard.