Can MCD demolish an old illegal construction

We had our house built back in 1980 with balconies on three sides. Balconies needed a repair lately as there was a risk that it may fall on the people going on the road. My father who is 74 hesitantly started this repair in Nov 2016 and has spent approx 8 months to get this done. However, someone complained about this repair in Aug 2018 (when nearly everything was done) and since then MCD had come 3 times and demolished 2 balconies and are now asking to remove the remaining. My parents live alone in this property (Father is 74 and Mother is 68) and they are in immense stress as they have worked so hard to get this repaired somehow at this age and now are seeing this getting demolished in front of them. My father is not able to walk and both his and my mother health had suffered a lot since Aug 2018. 99% of the properties in this area are constructed illegally and none of those properties are touched. It is only our property which is demolished. It is not fair to just target one individual (and old construction) who doesn't have strength and contacts to fight when all the other properties in the colony (and in Delhi) are constructed illegally. Can something be done to avoid further demolition email : [deleted]