Yes a certified letter is the next thing you need to do. I have a customer that agreed to pay me each mow which is every 2 weeks at $80 and haven't seen the check yet. I have called and left messages and reminder notes on her door. Its been going on 6 weeks now and the certified letter was sent out last Friday with late fee's. Got to keep on them!! Calls, Notes, Letter's just like the big company's do when they want there payment!!
G&B Lawn Care Service.