If the calls are coming from debt collectors, tell them to put the matter in writing and to stop calling you. Once the letter comes, make sure you dispute the claim within 30 days. In the letter tell them again to stop calling you. Send the letter certified mail/return receipt. If they call you again, sue under FDCPA (as supplemented).
BALTIMORE AND BETHESDA OFFICES (410)635-4122 or (301)678-3725