My minecraft account is tariq343, please help me

So i had this minecraft account for 6 years now and last week on the april of 12th i got logged out and when I tried to log in it told me that I need to buy it again, so I did and when I did , I never received any confirmation email but I was able to play for a day but after a day I was then again logged out of it and its asking me again to pay for it. Please help, because I have spent a money in it and if this will just happen again then I wouldn't want to spend another dime in it.