why does the mmr stay the same even tho i won so many times

ok so i had a pretty bad season 5 and my mmr was very low but this season i did great with many wins ( 7w 3l) but i still got bronze one and i was soooo freaking pissed of that i was thinking about writing a support ticket but then i realised that its not gonna help they dont fix anything rly. when i tlaked to them last time they didnt even awsner even tho my acc got stolen. so what im wondering about is why does the mmr stay the same it just makes it harder to get out of bronze so if riot would keep that feature away from where u get placed i would be thankfull by:IcePG
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