Repetitive caller every year. The deluge lasts about 3-6 months.

Modes Operand i
1) Begins with switchboard/reception in hopes of being transferred. When switchboard/reception has time to collate the info and starts advising that the calls are unwanted they move to stage two.
2) Use their data and their dialing system to send out a automated blitz which interferes with our normal business operations.

Result
- Marked as a nuisance call
- Asked by all employees to make it stop!
- Eventually move from nuisance call to number block