Am I being targeted by scammers?

For the past 2 hours 20 different 1-855-***-**** has been calling, each time the beginning digits 1855 is always the same but different numbers at the end. 20 times within the last 2 hours. It's driving me crazy, and to make it worse this is not on a cell phone, it's my landline. What can I do about this???
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