GWM HAVAAL Ontdekkers

I took my 2017 GWM Steed 6 Escape diesel bakkie vir 130 000 km service at the same dealership. They phone me and told me sump plug has been stripped and need to be fix at my own cost R 1300 ( after complaining it dropped to R 850) Various sources advised it cannot be wear and tear but to improper torque or not *****ing in correctly as after 13 service cannot be wear and tear attending to drain the oil..