I have a customer (new this year) that since we started mid month, I didn't bill them in April. I sent them a bill on June 1 for 2 cuts in april and 3 cuts in may for a total of $450 ($90 per/cut). I have been faithfully cutting every week and have not seen a payment. I realize its only the 15th but most everybody else has paid already. How long should I let this go? Should I stop mowing until I get paid? I don't want the grass getting tall because it will end up My problem. any advice appreciated.