Small Claims Court
For simple cases it is quicker and easier to do the claim direct most people are put off by not knowing what is involved and the high cost of solicitors.
when communication has broken down send a recored delivery letter
Notice of Intention to Issue a County Court Claim letter
Then after contact details on letter
without prejudice (as a bold centered heading )
State as the issue (brief description) hasn’t been resolved you are issuing court proceedings.
For straight forward matters in England you can use
Be aware that evidence in a claim must be suitable for a lay person without expert knowledge to be able to understand.
If your issue is technical you will need a brief independent source to explain it in lay person terms.
While a judge may happen to know about a specialized issue-it is not reasonable to expect them to have prior knowledge or be experts in the field