need help for a seamaster 300 watchco..

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hello all !
This is my first post on this forum
I bought a seamaster 300 once year ago (to use it 24 7 365)
look like it was not a real one but a watchco (with 565 movement), but it was too late to start a paypal complaint when I discovered this.
I have 3 problems with this watch:
1: I was diving in the sea (+-3m) and one part of the bezel went away: where can I buy a new one ? (no need to have a nos or something at 3000E on ebay )
2: there is a lot of scratch on the plexy, I have this watch 24/7 so lot of scratch are possible, do you know if this is possible to have a cristal replacement - I suppose there is a lot of tips to renew the plexy on the forum ?
3: I already ask to my local repair to maintain the watch, but after 500E of maintenance, my watch go sometimes too quick (between 0 mins/day and 5 mins/days), do you know a good guy in europe who can really maintain this ?
thanks for your times