Hi all,
Thank you for all your replies.
Couple of your suggestions have come in good use.
The Forum Sponsor Retailer is organising for the bats to be picked up, probably tomorrow, with a full refund.
Couple of other comments to:
Love to know the brand and model, $350au is a big difference on a major brand.
Skip, being out side of the UK, VAT doesn't apply so that takes off just under 17% I believe. So a 170 pound bat, becomes a 140 pound bat.
In Australia, we have the Goods and Services Tax (GST) of 10%, which you don't pay on imported bats either.
Its also the end of the UK season, so a lot of stores have bats on sale, which helps to reduce the price.
I was having two bats delivered to my door for just over $600.
Similar bats in my local cricket speciality store would be $500 per bat, working on similar models in that brands range. So, the same two bats in Australia would cost me $1000. One thing to point out is the considerably different time of the season. The UK end of season and start of Australian season means a discount straight away of UK bats. Even if you take the end of season discount off, your still talking probably at least $200 more in Australia for the same bats (and that still takes delivery into consideration).
Quite a sizeable weight difference. If a customer specifies a weight i wouldn't then pick out a bat on pick up and send it because it 'felt light'
I do try to stress that an ounce (maybe 2) here or there isn't too much and that balance and feel are much more important when selecting a bat. But of course the worlds most fantastically balanced 2'12 still won't feel like a 2'7, that weight gap is just too big.
We all have scales, they aren't hard to use.
Probably time to name and shame. I know its not me so I'm just an interested observer 
I'm a big supporter of pick up over weight as well. In fact, I actually don't care what a bat weighs,
so long as it picks up well for me. I know I've made a big song and dance about the fact bats weren't the weights that I ordered, but hear me out.
I've got four bats at the moment, 2 Indian SGs, an Australian made no brand and an Aldred. They weigh 2'8, 2'10, 2'11 and 2'9 respectively, so I'm not fixated on bat weights.
However, for the bats that I had ordered to have a 'perfect' pick for me, they needed to be in the weights I specified, otherwise they pick up too heavy for my liking.
This is why I've been so specific on this occasion.