Tele-Marketers are back again

Years ago I closed my home phone account with AT&T. Despite placeing our phone numbers on the States no call list the calls continued and AT&T could not help us in blocking these calls which increased month after month. For years we have used only cell phones but this week I started getting telemarketing calls. One in particular is so persistent. I got at least five calls from 206-203-2524. I have tried to trace the number and it originates in Seattle, Washington. I called my cell phone provider and they are going to get back to me. I wait.