To reach the AT&T | DISH retentions department, call 866-266-1292 , press 1, then press 1 again. Retentions departments are the gate of customer service you usually have to pass through to cancel service. They try to identify and solve objections to the service you have, either by pointing out features of awesomeness you apparently weren’t aware of, or by tossing credits or price reductions your way.