Worst Service received ever!

I bought a generator from R21 Trucking and Machinery, however I had to install this by myself or get other service providers to assist with the installation who then advised me the unit is faulty. R21 Trucking and Machinery came out on 2 different occasions to fix the problem on the unit however there was still call out fees from the electrician etc to be paid to establish why the unit is not working. R21 refuse to assist with this bill or even to phone me and discuss how we can meet each other half way.

I am extremely upset with the service I received and will not recommend anyone doing business or buy anything from them. Obviously the correct pre inspections aren't done properly otherwise this would've been picked up prior to the sale.