80% is from sponsor. And 20% is mine. But we also showed that husband has a pension fund of over 50,000 cad in home country
So you only have 14,000 CAD. That's not sufficient funds. So the VO was correct that you do not have sufficient and available financial resources.
Second, you're trying to use the study permit to immigrate your family to Canada. You're not applying to go for your studies. Therefore you were refused a study permit for purpose of visit.
Why do you need to bring your spouse and two children with you to study in Canada for a diploma course that you already have prior experience in? It seems to the VO that you're trying to get them to Canada under your study permit so your spouse can find work in Canada. Therefore your family ties to your home country is weak and the VO believe that you and your family will not return home after your temporary stay.
You don't have sufficient funds to cover your studies and living expenses therefore the VO refused your study permit because you would run out of money and not be able to return home.