HMRC Error

Payroll evidence shows all RTI correct but HMRC have now sent a tax bill for 2017/18 asking for tax but they have added 2 peoples income together and applied the other persons to me. Cant get anywhere by telephone calls and the information by the employer was sent correctly. My income was less than £10000 but say I owe tax on mearly an extra £38,000 which is someones elses wages. How do I sort this out?

Hi Janni,
As you've confirmed that the error is not coming from your employer, we would now need to review your record to identify exactly what's causing this issue.
Please contact us by webchat or phone here:
Income Tax: general enquiries
We can start to resolve this for you.
Thank you.