Hello, I accidentally placed a hot metal diya on my white plastic/uPVC windowsill, which caused a circular heat-damaged area. The surface has slightly melted and sunk inwards, with some yellow discolouration. I'm looking for a cosmetic surface repair rather than replacing the entire windowsill. Do you undertake this type of repair? Could you please provide an approximate cost based on the attached photographs? I am bit flexible with pricing just message Thank you.