Dishonesty and Lack of Intergrity

During 2013, I forwarded my application for a kitchen unit with Bradlows. This was approved and installation was done on 21 November 2013. Although we had agreed on a particular design they installed a different one, which left many gaps on my kitchen. The smallness of the unit is just not value for money. Anyway, a few days after installation we noticed there was a map in the wall which was a sign of a pierced pipe. I raised this with Bradlows and was told they do not do plumbing, I should get my own plumber, this is despite the fact that they are the ones who pierced the pipe. The other part of the unit was installed on top of a plug as result the plug cover had to be removed as it could not close. On following up again, I was told they will send someone to fix this, till date that has not been done. I therefore took it upon myself to stop paying the account until all my concerns were attended to. I only skipped December 2015, all along I was paying. Instead of them fixing the damage they made, they keep on harassing me with threats to blacklist me. I have had to hire a private plumber because I could see the further damage that was being caused by the leakage.