Dulux disgusting service

I am totally dissapointed with the service received from Dulux. . We painted our home in June this year with Dulux PVA in the colour of the year (more expensive than the off the shelf colours) which we purchased from builders express in Norwood. I was pregnant with twins at the time and needed the house to be complete before their arrival. Once completely painted we noticed marks on the wall which cannot be removed so reported this to Dulux I'm July. They sent a rep out to look and she said they will replace the paint ( not pay for labour we had already paid for... not to mention the inconvenience) this agent since left , have reported again to another representative and still no response.. our newly painted house is looking worse than before a coat of paint. Shudder to think what it will look like when twins start becoming mobile.

Should we repaint our house with a different brand and take Dulux on legally to have costs refunded?