I received the incorrect item. Sigma require an automated returns email before you can return an item. I completed this - 48 hours later received an email ignoring the fact I requested an exchange, not a refund. On top of this the link provided for a returns label etc was broken (did not go to a returns page at all) and the reference I was given to return the item was "n/a".
I now now have to wait for xmas period to finish before I will get a further response. I have had to purchase the item elsewhere so will now be returning this item and will not use Sigma again. The initial error is understandable, a dreadful automated after-sales process is not.
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