I recently had a terrible experience trying to take UBER from Santiago Airport STI to Sosua.
3 times a driver met me, drove a few feet, and wanted to negotiate the $ and they wanted cash.
Very frustrating as the reason I take UBER is because all that is pre-handled.
Each time I refused. UBER charged me twice, 40 cents and $1.60 US for cancelling the rides. I called my CC company and refused to pay these small amounts.
The whole experience was ridiculous and I will never do it again.