You should have done the following:
In case the required quorum is not present within half an hour of the appointed time, the meeting should have been adjourned to a later hour on the same day or to a subsequent date which cannot be earlier than seven days and not later than 30 days from the original date of the AGM. At the adjourned meeting, there is no requirement to have a quorum.
Therefore you can again hold a SGM and select the same PMC to regularise the whole process. If the qourom is not present, the minutes of the meeting will record the same and can become a problem if any member objects in the future. Therefore rectify it as soon as possible.