The bars are called "Resilient Bars" As you can see from the research in the link I gave you, this probably wont solve the problem. University research has found it is caused by the wall drylining touching the underside of the floor structure, ie the floor joists. There needs to be a gap.
Whilst Taylor Wimpey are employing a contractor to do the work, it is Taylor Wimpey that are instructing them.
Finally, it seems quite rightly, you are after compensation. You may or may not get this.
You can hope for up to £2,000, but unless an independent
New Homes Ombudsman is appointed by government, something I have been campaigning for, 4 years now, compensation will be a battle. Write to your MP tell him/her of your new home woes and ask that he/she writes on your behalf to housing Minsters Alok Sharma and/or DCLG secretary of state Sajid Javid.