PF contribution collected before PF registration - how can we pay?

Ours is new company with one employee, as per management decision we have taken voluntary PF registration. We have created the provision and deducted from Dec'17 to May'18. We applied in Jan'18 but we have got PF code in the month of May'18 due to delay from portal issue and other reasons. Our consultant also mentioned effective date as 1st May 2018 while applying. Kindly help me how can we pay Dec'17 to App r'18 arrear PF which we deducted from employee and company contribution. We have already created provision in books of accounts.

Dear Prasadponnala,
PF code number is allotted to you from 01.05.2018.
You need to make compliance of PF law from this date onwards and not from retrospective date.
You have to refund the amount deducted from employee immediately for past. It is consider as unauthorized deduction from salary which is a serious offence.