I was dismissed from my job of 3years after a customer complaint. no other complaint has been In effect to my knowledge. was this legal?

Depending on the nature of the complaint, it is probable you are entitled to severance pay as a result of a wrongful dismissal.

You can use the following link (http://severancepaycalculator.com/) to determine your entitlements and then contact us at the number below for a consultation with a lawyer to discuss your options.