Not receaving ranked rewards

I plaeyed competetive quite a lot a couple of months ago and managed to get up to masters (dps specifically). I never received my master role challenger or any of my other ranked rewards, i later on uninstalled the game and didnt play any games for a couple of months. Today i uninstalled the game again excited to grind a bit but realised i still havent gotten any of my ranked rewards wich dissapointed me quite a bit. Please find a fix for this as i see a lot of others players also having this problem!