You said you were away until the end of the week, didn't you? Pehaps they have been frozen due to 'unusual activity'. Ring the security team if you can find the number.
Happens to me ALL the time, usually when I'm checking out of hotels and in a rush.......I usually swipe, get rejected then stare at my phone waiting. About 3 minutes after, I get 'the call'.
HSBC have a thing on their website that allows you to enter travel plans to prevent this kind of stuff, but it has it's own drawbacks. I put a travel plan on and got it rejected when I got to Germany. Girl called.....
"We are investigating suspicious activity on your card"
"ok..."
"yes, we see you have travel listed under these dates to Germany, but saw activity in London on the same day"
"ok...."
"well is this correct, have you used your cards or given them to someone in London"
"WHERE in London....."
"Heathrow airport......was the last transaction sir"
"And now I'm in Germany.....what does that tell you?"
"That someone has your card?"
I explained that people use airports to get to their destination and that it can sometimes happen on the same day that you land in another country. It was totally lost on her, so she just turned my cards back on again.
<sigh>
BG