Have to pay R2300 for technical inspection for every car we interested in purchasing?!!?

My wife and I were interested in purchasing a vehicle from the Midstream branch. We sent the vehicle to Dekra Automotive Centurion, for which we paid R2300, only to find out that the car's belly plate is severely damaged! Now we have to start the whole process over again for which will most likely have to pay another R2300 for the Dekra technical inspection! This is unacceptable. Why should we have to pay for a technical inspection for every car that we are interested in purchasing? Webuycars.co.za should do and pay for the Dekra Technical inspection or any other technical inspection for every vehicle they have and then have the report on hand when a customer is interested in purchasing a vehicle.