These people - or company are idiots! I have received at least 4 calls per day usually around 7 or 7:15 am and 2 more again exactly 12 hours later. There is an unintelligible message and then it just disconnects. I've gotten with my VOIP provider and they figured out a way to get the call forwarded to the same number it's calling from so it won't ring anymore.
It the words of a fellow sufferer - Stop call me! I am ready for do something you go jail!