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Multiple replacement units & repairs would imply the 1020 is not fit for purpose.
I do not know how Vodafone deal with such instances (probably polar opposite to how I would).
A Vodafone rep should be in contact to discuss.
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Some networks have an "x repairs and you can have a replacement" policy. Vodafone don't, but will, as far as I'm aware, deal with each case on its merits. It's very odd that you've had so many problems with different handsets and I doubt there's a general problem that makes that particular model unusable. If there were, we'd have heard a lot more about it. I'm not sure how the "not of merchantable quality" (which I think is where you're going) argument applies when you've had replacements - the legislation would normally apply ( as I read it) to a specific example and not a succession of them.
Your best bet is to wait for the forum team to pick this thread up and see what they can do to help you.
There could be something in the browser settings that is causing you to get that error message. I've logged into the site from various different handsets and devices - all with no issues.