SSWC, it's tough when your cash-flow is tight, but if you leave an envelope and don't get a payment I leave it till three cleans; I'll just keep on adding up the cost and leaving an envelope - for three months running.
After the third month if I haven't got paid, I'll phone them and ask for the cheque to be sent. They're normally apologetic for sending on the money and I haven't had to drop a customer in a long long time for non payment; maybe two-or-three years.
Just be patient; people are often too busy with things they think are more important, can't find their cheque books, or forget. Don't think that they automatically don't want to pay and rip your off.
Just keep on adding it on.
