Help teacher making me do BTEC

so basically my first year at college has not been the best, i did pass two out of the 3 a levels i had done. only problem is my law teacher did not add my pass grade to the system so it only looked like i passed one , i went and told my law teacher and she said she would fix it, but i just got an email from my senior tutor who says i can only do a 1 year Btec, i really want to do an AS which i could continue and turn into an a level, i really want 3 fairly decent a levels so i can go to a decent uni , but no uni is going to accept 2 a-levels and 1 year BTEC . 3 a levels would make me stronger candidate. it does not matter to me whether i have to take on an extra year to finish that AS into an A-level. Any advice as to how i could voice this to my senior tutor ?