Sainsburys double up on nectar points dupes unsuspecting hard up young families. Nectar allowed double up vouchers to be exchanged for nectar points just minutes before the voucher expired. The confirmation MUST BE SPENT TODAY INSTORE came only after the transaction was made, when my son after receiving an email prompt, exchanged his points to purchase a pre-school toy for his young son, and was left with a worthless voucher as the stores were about to close. He called customer services the following day and the person spoken to was delighted to say they could not help. Shame on you Sainsbury's!