First of all can you please update by when you had enrolled for PF?
As per the PF for garment industry even if the employee strength is 10 and above the Contribution is mandatory. The contribution should start from the month of of Aug 2013 onwards.
If you are asking any queries it is better to mention the name too
On a practical note, the date of coverage begins from the date of registration of the establishment as mentioned in the Registration Certificate issued by the Regional Provident Fund Organisation. On the basis of the information it is unclear at what date the no of employees exceeded 20 in your organisation and since when your organisation is covered by the PF Office. The Registration Certificate specifically mentions the date of coverage and ideally you should commecnce from that date.
Hope that helps.