Noelli

Hello, I worked in the same place for four years (July 2019 until June 2023), on a zero-hours contract, but when I got promoted to team leader (at the end of 2022) I got a full-time contract. After I left the company, I noticed that they made a mistake in paying my service charge, I got in touch and they fixed it. The only information about this employer in the HMRC portal is the period where they fixed their mistake (August 2023) and nothing else, like I never worked for them before. I got in touch with the company's HR by email but I had no answer, I also sent a message to HMRC months ago about it and I had no answer. What should I do? (I have all the payslips as a proof)