MEX will try to force you into upselling additional car insurance even if you have already purchased

They tried to make me sign a paper that I would be have to pay for the $29,000 cost of the vehicle if anything happened to it that they saw no insurance purchased for this rental. When I refused they charged me $137 insurance fees. This $137 was more than 2x the cost of the insured rental. They did not have WiFi available so it was hard to debate the counter rep to see the fine print so they bullied me into getting the additional coverage. This started my vacation off poorly.