Pool claim after earthquake declined after 4 weeks from reporting it

With the numerous earthquakes in Johannesburg area, my swimming pool cracked from the bottom to the top of the stairs. It took the insurance company 3 weeks to send out an assessor and then they declined my claim saying the water level is low and it’s poor workmanship. After 3 weeks the water level will drop yes. What poor workmanship? My pool was not leaking before the earthquake. It took the insurance another week and a half to let me know they are declining the claim. This is very poor service and no reason to decline my claim.