Terminated without notice and pay

Dear Sir/Madam, I have been terminated by my employer without any notice, i was verbally told i will be paid 20 days of salary but was only paid for 15 days and also i have not been paid my variable pay which depends on company and individual performance(As per offer letter). My offer letter does not have any terms with respect to notice period or termination. This said 1) I have not received any communication from my employer on my performance, company performance or the reason why i have not been paid my variable pay, i have sent them an email asking them for the same 2) I was not give any notice and was asked to leave immediately after finishing off my pending work which took 5 days, i was verbally told i would be paid 20 days of salary however i was paid only 15 days I need advice on whether i can pursue this case in court since my variable pay has not been given out and this amounts to a huge sum. Many other employees have been given 100 % payout of variable pay. There are no clauses defined for the pay out of variable pay except a mention of it depending on mine as well as company performance. Regards