Hello,thank you for your question. My name is Tony and I can answer this for you.
As a leaseholder, you can apply to the leasehold valuation tribunal to have a professional management company appointed to oversee the management of the company where this is not being done properly The Tribunal has a power to do this under s.24 of the Landlord and Tenant Act 1987. The legislation is here:
Here is a link to a guide from ARMA (the associarion of residential managagement agents) guiding you how to do this: http://arma.org.uk/leasehold-library/document/appointment-of-a-managing-agent-by-a-tribunal/page/1
Also, I have a link to a tribunal decision here, so you can see how a tribunal looks at the law and applies it to the power under s.24. It's something of a case-study really for you to look at: http://www.residential-property.judiciary.gov.uk/Files/2010/August/00105O29.pdf
I hope this answers your question.