Two points:
Firstly, if you had a contractual entitlement to a pension at 50, it can't be changed retrospectively. The employer/PF Trustee may agree different terms for new entrants, but I don't think you can re-write the rules for existing employees. You don't make it clear whether you are in private or public employment but, if the latter, even the Govt has made very generous provision for existing retirees whilst trying to rein in the cost of future pensions.
Secondly, though, "you work most your life then your told you need to work some more". Errrm, if you retire at 50, you DON'T work most of your life; you may have worked for 30/35 years and then expect a living income for potentially the next 50 years and therein lies the problem. In my Dad's day, it was not unusual for people to live only 3-4 years into 'retirement'; now +/- 30 years is the 'norm'. For public sector employees who retire on a %age of final salary, do they understand the capital sum required to buy such an income? Certainly well in excess of their contributions. Something had to give, I'm afraid.