I shall humor the OP who was rejected by these fraternities.
If there was something on your dorm room door, that is not an official letter of rejection. That was people being mean. If such a mean letter on your dorm room door does exist, forward it to Greek Life/the national body of the fraternity for further investigation. That does not mean you will then be accepted by the fraternity but it means that the fraternity will be investigated and possibly punished.
Good luck.
Go away.
