Documentation Process - Adjacent Property

Dear Lawyers, I have two adjacent flats that has already been combined by merging the living rooms. Please note that the wall that was modified is NOT a load bearing wall or does not effect the beam or pillar in anyways. I bought the property in as is condition where the previous owner had already merged the flats, both the flats have separate agreement, have separate society bills & electricity bills but are registered to me as the same owner. Now few residents of the society have raised objection to the merger of the flats, I wanted to check with the respected lawyers in the forum. 1) If the members are justified in raising an objection? 2) Is there any documentation that I need or should have taken into consideration while purchasing? 3) I have a certified architects copy that was provided by the previous owner to me during the purchase & is also available in society records. 4) I also have the copy of society approval for merger that was provided by the previous owner. As of now the society managing committee has had no objection, only 2 of the residents have raised this concern. What exposure do I have in this case & is there anything that I need to do to be on the safer side? Thanking you in anticipation.