Scenario: I work at a supermarket, doing part time shite. I'm quitting at the end of the month.
I was paid on the 7th-ish, in cash as they had (again) fucked up the wages. I was due about £350. They tried to pay me £771.
After a crisis of conscience, knowing that they are completely incompetent and theres a low chance of them finding out anyway, I told them I was overpaid.
Situation was sorted out, they said there was a mistake on the pay slip and they didnt know why. Yesterday I went to the bank and depositied £320, adding to my already £100-ish balance.

Today I go to check my balance: £1140-ish

So basically it looks like they've paid me the £771 I wasnt supposed to get, along with the wages I was supposed to get.

What the hell should I do? Tell them? What?