Less than acceptable work done

I renovated my flat in 2014- I was charged a fortune and the workmanship is disgusting, everything is falling apart, I have cracks EVERYWHERE - a Bulkhead that is falling down. There was no project management. Was ripped off , quoted one fee and add on's for work and no deductions where work was not done. Builders abandoned the job before finishing due to not being paid by AMCON despite me having to pay him weekly, thus the workers performed badly and the quality of work declined- Floor was damaged, windows badly inserted, THEFT of goods ! I would never advise you to use this company - you will pay a premium price and get below average work , and like myself you will have to pay someone else to repair the damage and bad workmanship ! The work was also not finished during the time frame given.