I ordered 1 packet of sushi rice as part of my online shop and Sainsbury's sent me 10 packets of nori seaweed as a substitution - and charged me £20+ for the privilege. Pretty racist substitution, why not just send me 1 bag of different rice? They issued me an online coupon for their site, which didn't go through when I placed an order. I rang customer services and they told me that "it happens and vouchers disappear sometimes" and reissued me with another coupon. Frankly I just want a refund of the money they stole from me but apparently their "subs policy doesn't allow".