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If it's new then speak to the shop and return it. If it's used then take it up with the seller and then PayPal. Don't go hunting down parts when you don't have to.
Finding Well stuff in particular is pretty damn hard, but perhaps try searching for other clones or for the Tokyo Marui part (as these may be more well stocked). Here's a link to the TM manuals.
Ordering direct from them is tricky as you need to put in a minimum purchase, but places like Impulse should still take single orders for replacements. Also Eagle6 and Firesupport do orders from TM, though they usually tack it onto a larger, infrequent order and so you may have to wait some months for it to arrive.