There is a formal appeal process if you want to challenge a decision about universal credit

For universal credit, if you are an owner or director of a limited company you may be treated as though you are self-employed and the company income treated as your self-employed income. 

Your pay as an employee will usually affect the amount of your universal credit award. In most cases, information about your pay (as an employee) will be sent to DWP and DfC automatically from HMRC and this page looks at how that information is used and in which assessment period.

This part of the website explains how universal credit works if you are self-employed.

If you are claiming universal credit you will usually be placed into a work-related group. Each group has different work-related requirements. Some people will be placed in the no-work related requirements group. Your claimant commitment will show which group you have been placed into and what is ...

Universal credit awards are made up of a number of elements. This page explains how universal credit awards are calculated.