Hi MY aunty sprayed the leaves with leaf shine and as a result the leaves are all drying up and dying.

Please help, if anyone has any suggestions as this is a beautiful plant.

The only thing I can think of that you can do is wash off the fronds/plant and cut off any fronds that are definitely dead, cutting them off at the end of their stems, don't cut into the plants crown. Washing that shine stuff off might help save a few leaves that are still somewhat healthy for the time being, hope for new growth and no more spraying.
A moist cloth with water is the safest way to keep the leaves clean, even though they won't be shinny, they aren't in nature anyway. There are many horror stories like yours having to do with using many leaf shine products out there.
Make sure the Palm is not in direct sun and the soil not allowed to dry out completely. Keep the soil semi moist at all times, water when the top inch or two feels dry.