Tesco have form for dodgy subsitutions. Once ordered some condoms along witht he rest of the groceries and got delivered a bag of potatoes as substitute. The delivery driver was somewhat perplexed when we pointed this out, after rolling around wiht laughter.
Many years ago also received a tv/vcr combo, totally unsolicited and unordered, and with no paperwork. Held on to it for 6 months before keeping it.
Also once received a duplicate electronic effect rack for the guitar. The shop took ages to deliver the one I had paid for, so I popped in when I was in town and collected one. Got home and the delivered one was on the doorstep. The shop then refused to take the extra one back…