I do few trips a year on EY via AUH, every time i usually see a long line of wheelchairs waiting for flights, especially from the Indian subcontinent. In a matter of fact i see more wheelchairs in AUH than any airport in the world.
Few years ago i flew with a lady who needed a wheelchair to CDG, we did have to wait for over an hour for one, at the time they (AF) was subcontracting the wheelchair and only 2 wheelchairs were available to serve all flights.

I suggest to follow up with EY, as per message above, see what went wrong, and what EY is offering.
Please keep us informed.