I bought a ford bakkie on saterday 22 feb 2025 threw capitec bank

I bought a ford bakkie on saterday 22 feb 2025 threw capitec bank. On Wednesday 26 feb 2025 the gearbox broke. I phoned the dealer and spoke with the manager. He told me it is not there problem. I tookbthe vehicle to the mechanic and he said that there was recently been worked on the gearbox, by the red gasket sealant that was visible. The gearbox must be repaired.