Hi.

The creases may not disappear even if you can pull out these creases. What I have tried before on a very minor dent
was dip a fine weaved rag in boil water, and or carefully soak the damaged part in boil water, but keep an eye out for
melting of the plastic. After that, i tried to push the dent out with the hot rag. It did help, but I couldn't get the creased
line to go away. Good luck.