The rules for stat rolling in 5e are:

Roll 4 x 6 sided dice
Remove the lowest dice result
Add up the remaining numbers to get an ability score
Write down this ability score on note paper
Repeat these steps until you have 6 ability scores
Assign a score to each attribute on your character sheet.

Where is the part that says "You can re roll as many times as you like until you get your desired scores." ?