Wrong wage

Hi everyone, I’ve just seen my payslip for this month and in total they’ve underpaid me by 20 hours in total (normal rate). If it’s to be sort out by this pay day do I receive the full amount I’m owed or will it get taxed extra? Thank you

Edit: Wagestream has the correct wage amount and hours that I’ve worked but the payslip it’s wrong(normal rate) . So would I still receive the right amount or will it pay me with what the payslip says?