Disaster boosting

So , I bought a DUO 500 MMR from the guy and my experience was terrible.
First of all the booster was so rude...every time I died he felt the need to ping on me and show me the seconds I have left to respawn , was like saying "look you died again" , after all who is the booster me or him?
Win % was at about 60% which if u ask me that is very bad for a boosting service...
Last 4 matches were all 4 of them lost , so I just dropped the boosting at about 300mmr from the 500 mmr that I bought , cause I couldn't stay there and waste my time with that 60% win rate....when I could have played with my friends and have a 50% win rate.
Here's a pic of last matches: