Finger Dented plastic domes

Hi my little sister pushed the dome in on my speakers. 2 finger pressed dents.

I have tried a vaccum and masking tape to try pull it back out but no luck..
The dome is plastic so it would make it alot harder then a fome dome which I have in the middle but thats not dented.. the plastic bit is? Anyone know how I pull the dents out without damaging the speakers

These are them.

http://www.oyyy.co.uk/product.php/7...kers?jssCart=637450f03165fc31bb8adc8fce485be1

 

i had some speakers where my buddy's kid did this and it made me mad every time i looked at them..... i ended up selling them... the foam covers will hide it tho'

 

I would like a fix..

 

bumping..