Many thanks for your patience. If you did not have a contractual notice period then on resignation you would only be expected to give a week’ notice. So if you had given that and the employer did not allow you to work or just did not pay you then that is the first thing you can pursue them for.
Overtime - there is no legal right to be paid for overtime, unless you are contractually entitled to overtime pay. So it will depend on what the contract said about overtime – if no overtime clause existed which entitled you to overtime pay you do not have the right to be paid for overtime unfortunately. However, then looking at the hours you did, including overtime, and the pay you received for that time, it must not fall below the minimum wage.
Expenses – these are specifically excluded from wages so to pursue these you must make a claim in the small claim court.
Holidays will be claimable in tribunal so it will depend on how many holidays you had accrued by the end of your employment and how many you had not taken.
Discrimination – you will have to prove that you were in fact treated detrimentally due to your nationality. Just because you were the only one not paid and you were of a different nationality does not automatically mean that nationality had anything to do with their actions. So you must be able to show proof that nationality had been a relevant factor in their decisions.
I hope this has answered your query. I would be grateful if you could please take a second to leave a positive rating (3, 4 or 5 stars) as that is an important part of our process and recognises the time I have spent assisting you. If you need me to clarify anything before you go - please get back to me on here and I will assist further as best as I can. Thank you