So i was working for...

So i was working for the company for almost a year and a women sent messages saying we stole from the company and went for a polygraph test and as i know a polygraph test normally takes 90 minutes to 2 hours and we where there for 15 minutes and the let me know via WhatsApp that i **** and that i need to resign via a letter or els the make a case against me for ***** even if i did not ***** anything from the company so they basically fired me on the spot without notice or anything so what must i do in this case because according to me this is unfair dismissal