Anyone being bothered by these calls, should send a cease and desist letter to IMC along
with a request to remove your number from their internal call list.

The Federal Trade Commission, which operates the Do Not Call Registry, says:  A consumer may ask  a third-party telemarketer  (IMC) calling on behalf of a charitable organization. (NRA) not to receive any more calls from, or on behalf of, that specific charity.

If a third-party telemarketer calls again on behalf of that charity, the telemarketer may be subject to a fine .

These calls should be reported to DNC authorities.  IMC is NOT a charity and is subject to the rules.