Do not do any work for this company they called me...

Do not do any work for this company they called me to attend a site in Sydenham in May 2015 after 30 days I rang to follow up on my invoice they told me I was not on their contractors list so could not pay me, tried to chase them Stuart Pillinger a QS told me on numerous occasions that he knew about my case and I would be paid by the end of week each time it was not even a large invoice and I have only bothered to chase it out of principle but do not advise anyone to do any work for them.