I was terminated at work this morning without giving a warning letter or anything.The reason was because I didn’t wear my uniform and didn’t respond to email from supervisor on time

Thanks for writing to us. You are almost certainly owed reasonable notice of your termination or payment in lieu of notice. I suggest that you use our Ontario Severance Calculator (https://www.severancepaycalculator.com/) to find out how much you could be owed and give us a call at the number below in order to discuss your situation in further detail.