I can't determine from your post whether your parking area is a garage or an allocated space within the building's carpark, but it seems that whatever the case, the wet-well is in place to provide drainage collection for the entire basement area.
That being the case, the wet-well and pump is Common Property and the responsibility of the Owners Corporation.
My son had a similar experience with his allocated parking space within the basement carpark of his Unit Block, where alkaline seepage from the ceiling damaged the paintwork of his vehicle, and the Strata Manager went on about basement carparks being wet-areas with no requirement carspaces to be waterproof.
Armed with my advice, including about the absolute requirement for O/C's to properly maintain its Common Property, the O/C's Insurers paid for all repairs to his vehicle. The success of the claim was primarily because the O/C was aware of the seepage problem, and yet did nothing to rectify it.
So make sure that you advise your O/C in writing about the wet-well and the leakage from the wall areas, and that if any damage to your personal property or to yourself (slips/falls) arises as a consequence of that Common Property fault, you will hold the O/C responsible.
That should get them moving!