If this is a debt collector, bear in mind that, pursuant to 15 USC 1692d(5) and (6), causing a telephone to ring or engaging any person in telephone conversation repeatedly or continuously with intent to annoy, abuse, or harass any person at the called number, or, the placement of telephone calls without meaningful disclosure of the caller's identity, is an abusive practice under the Fair Debt Collection Practices Act, and may subject these people to liability under federal law. Keep a record of the no message calls that you receive.