They push their guarantee very strongly, but don't...

They push their guarantee very strongly, but don't honour it. They get you to sign a sheet when they do the work and hidden in the small print is a disclaimer saying there's no guarantee on this piece of wor . Very underhand.
The reference number is either 3018128 or 30/8/28 its difficult to read.
I did make several calls to your office and spoke to a number of different people who all showed no interest in completing the job that you started, so I'm surprised you're coming back to me now. You've had ample time to resolve this previously.