Rip-off and unbelievably rude counter staff

I really can't believe how rude the the counter staff was. I don't know if it was a high pressure sales technique but the guy did his best to make me feel like an idiot for not taking "option 2" to pay an additional £100 and having full coverage. I insisted on taking the option with no additional coverage but then the deposit required was 1600€, which is much higher than the "Estimated deposit amount: 8250.00 HRK" (approx 1100€) as stated in the terms and conditions. This is more than the limit on my credit card, so I had no choice but to pay an additional £100 to get the additional coverage. I feel this is an extremely misleading, underhand technique to make you pay an extra £100. I told him I've rented from Goldcar 3 times and had a consistently bad experience and he said "well you're an idiot for booking again, do you want to cancel? There are plenty of other providers here. Goldcar would be the best company in the world if your credit card had a high enough limit". So rude! When booking through Easyrentcars I was disappointed to learn it was with Goldcar. I will be writing to formally complain to Easyrentcars and Goldcar/Rhodium.