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[Pandoras_box]

If you can reach yourself on the sims then the trouble is not with O2, it's with eBay.
You have the following options:
1. Purchase £10 per sim and ring eBay yourself. Stealth accounts are supposed to make you good money, but it also cost something in investment.

2. If you can only afford to spend very little, purchase sipgate basic + UK call package for £9.99.
There's an option to display a custom caller ID where you can enter any number you desire. It works well for eBay.

As regards your accounts getting suspended, I suspect eBay now uses advanced tracking technics and also tries to verify your data if anything is amiss. Amiss in this instance would be anything their overzealous bots picks up.
This is my theory based on observation - so don't take it as a final position.

Yes, you can block WebRTC. The trick is to do so naturally. Opera does this very well, and websites would not see this as sinister compared to using an addon for example.

You should also vary your font fingerprints on every VM. Don't just use the default fonts. You can use this font pack or any others you find online.

You should also block WebGL.
Don't block anything by addons. Use your browser command-line switch instead.

Other things you can do is use different versions of any browser of your choice. I'd stay away from chrome/google ecosystem entirely as it is bad for stealth, in my opinion. One of the many naughty things google does is that it syncs your directory structure and even your Windows account username back to chrome. And Google is in the information selling business. No other modern browser does that with your computer username. eBay cannot see your computer username even when you upload photos and you'd want to keep it that way.