Received a random payslip via email?

[Poodle]

They won't have contacted you regarding a tax rebate, that's the realm of hmrc. If it hasn't come through to your bank i'd just advise them that they've obviously sent the payslip to the wrong email address and ask for written confirmation from them that you haven't been paid, then you have proof just in case it somehow does end up affecting your tax (which it shouldn't, unless the p45 shows that £233 as earnings).