Employment Lawyers Can Answer Your Employment Law Questions
Hello, this is MarcInLaw and welcome to JustAnswer. I will be the lawyer working with you today and I will be happy to advise you to the extent possible on this platform.
I am sorry to hear about your underpayment issue.
You may want to issue a letter before claim addressed to the agency where you set out what the issue is, how much they owe you and require them to pay you the funds within certain timescale. You can find good templates for free at: https://www.which.co.uk/consumer-rights/letter/letter-before-small-claims-court-claim
If they ignore your letter take them to court. You can issue a claim in a small claims court here:https://www.gov.uk/make-court-claim-for-money
I hope this helps. Please let me know if you have any follow up questions.