Toyota Hilux running at risk

Trying to get hold of Toyota is impossible. Mailed them asked them on Istagram with nada reply. Big reason being a Hilux had an oil leak at a mear 110000 km, trying to figure if the seal should have been replaced part of a service. I was lucky to find it because that seal could destroy the differential and want to make sure if on all levels if I should reservice the entire car as it seem running at risk. That not the only thing as the branch charged me R2500 to replace a R200 seal.