Hi DeeW
Welcome to the forum, you might want to have a look at the following FAQ which explains where everything is.
Welcome to Benefits and Work .
You are not alone, we have had quite a few enquiries concerning the waiting time for an assessment. A 13 week assessment phase applies to all new ESA claimants. The assessment phase can be extended beyond 13 weeks if there is a delay in completing this assessment.
If you want to try and move you assessment up the chain you could ask your MP for help.
Unfortunately some MP's are more pro-active than others, I would copy in Thérèse Coffey Secretary of State at the Department for Work and Pensions.
Don't forget to check out our guides to help you with your assessment preparation. Our ESA/UC Claim guide has a section on the questions you are likely to be asked during the call.
www.benefitsandwork.co.uk/help-for-claimants/esa1 Gary