They call twice a day, every day.
Its a scam business that comes to your door telling you there have been complaints about water quality in your neighborhood. You give them a sample of your tap water and they come back telling you there is something wrong with it, using fake scientific jargon, etc. Then they start calling you to sell you purifiers, etc. Called me 7-8 per week. even on sunday.
I'm getting calls daily; doesn't leave a message. This has been going on for about a month!