After 5 years i was let go for reasons that i should not have been fired for not serious enough matters do i have a case?

It is not clear from your question whether or not you have been offered any severance pay as a result of your termination. If you haven't been (i.e. if you have been terminated "for cause") then the threshold for the company to prove as much is very high and you should absolutely contact an employment lawyer at the number below to discuss your potential entitlements. However, even if they are offering you some payment as a result of your termination, I would still recommend reaching out in order to ensure that you are being provided with the appropriate amount for someone in your circumstances.