Did you open an item not as described case the first time? Or did you just ask the seller for a replacement?
If you didn't open a case then, open one now if you are still in time You get 30 days from the date the first pump arrived. The seller gets 4 days to refund and if he wants the items back he must send you a tracked paid for label. You will be refunded when the tracking shows delivered or attempred delivery.
There is no provision to claim for consequential damage, you can only claim for the item you paid for. If the seller was a UK business you can complain to trading standards via Citizens Advice.
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