What to do

I ordered grocery from sainsburys online and on the day of my delivery, my payment card got declined. That's bcz my order total was £47 and they charged £52 and I had £50 in my account so the payment got declined. Why they charged more was bcz they didn't have some items so they send substitutes and those substitutes were higher in price. I called sainsburyds when I got msg that my card has been declined and their number was busy, I tried for more than an hour. However, later my order was delivered but I wasn't charged for it.
So in short, I got my order but they didn't charge me anything.
Should I call them and let them know so they can charge me or just stay silent and just keep it??

you MUST definetly tell them cauze if they tell the police you are going to spend some time innbail and kid u not u aint wanna
go
do u hmmmmmmmmmmmm????
JF ZAK
TELL THEM WHAT HAPPENED

you MUST definetly tell them cauze if they tell the police you are going to spend some time innbail and kid u not u aint wanna
go
do u hmmmmmmmmmmmm????
JF ZAK
TELL THEM WHAT HAPPENED

Lol why would they tell police? It's not really my fault as I immediately added more money into my account and called them for hours just so that they can take the payment but they just assumed that my order never arrived.

You know what you want to do - why ask?