I realise you're not happy, but its something people buying a quality watch tend to know, and it is in the manuals, and on the website, and all over the internet, and the fact that you've had your other watches pressure tested tends to indicate that you had heard about it as well. To not worry about it is a little akin to buying a Mercedes then taking it to the dealership after 5 years of no oil changes or maintenance and expecting it to still work simply because it cost a lot.
I've got quite a few Omega manuals and they're all basically the same, explaining on page 4:
"
Water-resistance: a watch’s water-resistance cannot be permanently guaranteed. It may notably be affected by the ageing of gaskets or by an accidental shock to the crown. As stipulated in our service instruc- tions, we recommend you have the water resistance of your watch checked once a year by an authorised OMEGA Service Centre."
You can see a copy here:
http://www.omegawatches.com/fileadmin/customer_service/user_manual/OMEGA_User_Manual_EN.pdf
After getting the movement replaced, change the seals and pressure test regularly and it will last a very long time.
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