How much to charge for a strapline?

[Boss Hog]

Collecting payment can be hard if the client is being stubborn but there's always small claims court if it comes to it and many will pay up once threatened with court action.

Taking someone local to you to the small claims court is fine, but somebody at the other end of the Country can be a complete nightmare...from personal experience.

Also see here: Customer owe you money?

[Minuteman Press]

It is vital that work is agreed front end and a written quotation (physical, email etc) provided - which includes your terms and conditions - this is a key element of a contract.

I get the impression that this has not been done? You should absolutely charge the full agreed amount for work ordered and completed - unless you cannot show an adequate contract.