Create an as-official-looking-as-you-can-make-it invoice for your time,
and send it as a PDF; they'd probably pay it. You've tolerated them
messing you about for longer than is humorous.
(You _could_ add a rider that your fee would be waived if [insert
whatever you want here] within x days, in the manner of parking fees
etcetera, but that would probably make it look less official, unless
you're very good at it.)
Follow through with further (rising) invoices if not paid.
--
J. P. Gilliver. UMRA: 1960/<1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf
The average US shareholding lasts 22 seconds. Nobody knows who invented the
fire hydrant: the patent records were destroyed in a fire. Sandcastles kill
more people than sharks. Your brain uses less power than the light in your
fridge. The Statue of Liberty wears size 879 shoes.
- John Lloyd, QI supremo (RT, 2014/9/27-10/3)