I have been self imployed now for a year now and been working for the same company and I have always had pay slips up until 3 months ago I haven't had one and I heard a from someone who left that the company haddent paid his tax for the year how do I find out that there paying mine please help

If you are self employed then you pay your own tax - your employer doesn't do it for you. I assume that what you mean is you are a contractor, not a regular employee. Consequently you are responsible for filing self-employed tax (i.e social security) as well as making estimated tax payments.

You say you haven't gotten a pay slip in 3 months - are you being paid?