So work reckon they don't have my MATB1 form and just mention it now when I'm due my first maternity…

So work reckon they don't have my MATB1 form and just mention it now when I'm due my first maternity pay on Friday! The lady in the office I passed it on to to email it across is off work till Monday, the guy she apparently emailed it to is on Paternity for a week & now my midwife who I could get a duplicate copy off is off work till Tuesday! 😡 Been told by work they can't backdate any money either so I have to get them the form asap or I don't get didly squat. It's a piss take when I handed the form over when I was 20 something weeks and even discussed the day I wanted to leave with them. I seen the man that deals with it a week before I left and he never mentioned a thing to me. I'm loosing out on a full weeks wage now 😔😔