Rapido charges more than what it shows if you take a cab from airport

Couples of week ago, I was returning to Bengalore and was booking cab for my home. Rapido was the cheapest with a difference of ₹100-150. I took a Rapido and the guy called and asked me to come to pick up point. After sitting in the cab and providing OTP, he “informs” me that there will an extra charge of ₹160 as he came up to the pick up point. He also mentioned that this does not show in the app but we meed to pay. I was in no mood to hassle so I complied and thought of dealing it with Rapido customer care. To my surprise, they said it’s fair and since he came to the pick up point, they should get it. My take on this is two fold - 1. Why it was not mentioned before on the call that there will be an extra charge? I guess they are trying to make you think it’s cheaper and then charge you. 2. I often make business trips and i have to submit an invoice for the reimbursements. Things like this make me lose money, even if it’s ₹100. If it’s a thing add it in the receipt. So, whenever you want to take a rapido from airport because it’s cheaper, it might not be.