I was working approx 12 - 13 hours a week but submitted timesheets based on what i worked. it was all rather flexible and i worked a few more hours this particular week because i was hoping to finish something i was working on

I was an employee with a contract so I submitted a timesheet. only worked there 6 months and never had problems before.

I handed my notice in 3 weeks ago and my boss is disputing my hours / workload for the period of time I worked (2 weeks.) My job is working from home and I completed some data entry which they are saying doesn't add up for the hours I've said I work. Where do I stand legally? I was never set objectives or a input per minute schedule for the work.