I left my employer and did not work my notice. They said they would withhold my last wage. I did not argue this, and just put it down to experience.
Now today I learn they have told HMRevenue that they DID pay me. I have proof that they did not pay me.
What the heck do I do?? It has affected my Universal Credit payment this month by a LOT (I am now self employed by get UC as a top up as a single parent)