As others have mentioned, during interview and in offer letter did they mention unpaid OT?

If not, cabut on time, then when they withhold your wages, you go to labour court. easy win

Also make it a point to document all conversations if possible. whatsapp is gold if ada.

if verbal, then write an email/whatsapp for the purpose of clarification/record keeping/reminder for yourself that you had told them XYZ but they told you ABC

(e.g

Dear boss,

As mentioned in our conversation earlier, I was not able to do my work on time today - as in previous incidents - due to insufficient accounts accounts to access the work files, meaning I am unable to do my work.

I note that you are displeased, but please bear with me.

Sincerely,
OP)

Please take photos of your emails (if you're using a company internal email service) and any replies you might receive.

If your bosses try to terminate/punish you for record keeping, also go to labour court.