PF deduction - rule in Act which allows company to reduce the PF amount to Rs.1800?

Helloe Everyone,
There is a situation about PF deduction. I would like to take your views on that. As per the rule of PF it is 12% deduction on basic. But there is a company who deduct PF 1800 Rs from both side if CTC is more then 30000/ month. Now whether anyone who get CTC of 1lac or 2 lac they deduct PF amount only 1800 rs. We have calculated in all manner that Rs. 1800 amount is not 12% of the basic salary. Will you please guide me is there any rule in Act which allows them to reduce the PF amount only upto 1800 Rs.?
Thanks
Atul khanna

Dear Atul,
Yes there is ease to the companies to lock the pf at 15000/- basic. but, it is to be done right from the beginning. previously it was 6500/- that ceiling limit has been raised to 15000/- if you'll calculate you will get the math of 1800 as contribution.