OK - start afresh. Assuming it's worth the bother/principle - £50 plus for bother £10 plus for principle!
Who asked for the work to be done? Go to them. If it's "the lady in work" and work isn't far away then turn up at the offices and ask at reception.
Get her name and job description. And phone number. Phone up and ask to speak to her. If she is senior then you have to get through the receptionist. Ask to speak to "Mrs XXX in Accounts payable, please."
You might get a couple of "not ins" (AKA here but hiding) but if you get through say I was told by AAA at (where you did the work address) that you were responsible for settling the account for cleaning their gutters; I have been waiting ten weeks now - can I have my money please?
You will get either of:
Yes here it is/I need authorisation/our payment run is next week next month etc./wotchoo onabout?
Slowly and methodically work your way through all the excuses until you get paid.
If you find the answers unacceptable and you won't be messed around then tell Mrs Lady that you will down her offices and that you expect the matter to be sorted and your money paid.
Make good on your promise and turn up on the next rainy day when you would not otherwise be working.
Go to office and in reception ask to speak to Mrs Lady. If sorted then great. If fobbed off don't let it ruin your day but explain "I'll be back"
Now your goal is to embarrass the company. Sit in reception, cause a non-violent fuss; say loudly "I've done the work I expect to be paid!"
The best one is to make a placard saying "XYZ Ltd are bullies. They owe the window cleaner £50 and won't pay him!" and stand outside just as they are arriving for work.
If they call the police walk away immediately saying loudly "Don't worry I'm leaving! But I'll never forget!"
*Go home and plan your strategy, my dear Colonel!
*Go online to
www.nerdarmyreenactmentsareus.co.uk and ask to borrow an armoured car. Go to their offices with a grappling hook and smash their reception windows and drag the frame out.
*If they still won't pay then get a flight to the Ukraine and pick up a secondhand battlefield nuclear weapon that will work in a bazooka. Go back and nuke'em!
*Ok maybe somewhere around the last two or three suggestions I went off into fantasyland!