Tesco - have i been scammed

cjcooper

sorry for putting it here i dont know where else to put it,

yesterday i made an online order with Tesco direct and today i got a phone call from someone claiming to be them asking for my email, address and last 4 digits of my card, i stopped short of giving the card numbers and immediatley he wanted to end the call, he said it was just normal security.

so i emailed tesco and they have called this evening to say no one from tesco has called you today.

im really worried, i have chnaged my online tesco password and i only have a pre paid credit card so there is not much they can do with it.

but how could someone have known i placed an order and then rung me to ask about it