
Quoting
brownj12
Call your Landlord and explain that you are still planning to move and that you made a mistake by not responding to the letter in time. These are two situations here, the first is that your landlord (or someone that worked for him) didn't pay attention to the fact you said you were moving out, or otherwise forgot and renewed your lease in error. If that is the case then I am sure they will gladly fix it provided they can find new tenants before you move out (which should be easy if the new lease starts in September). The other possibility is that your landlord is trying to trap you in the lease and you fell into that trap (I find this less likely).
Are you in college? Does your school have an office or group that deals with student tenants and their landlords?
Step 1 is to call the landlord, be honest about what happened and ask what you can do. He may say no problem since you are just over the 1 month mark. He may want you to do the leg work of finding a new tenant. If he tells you that you are stuck then it is time to move on to another course of action.
Step 2- Contact your school assuming you are in college or living near a college based on your lease term and the time frame for renewals. They likely have someone who deals with these issues for students. They may be able to prevent the landlord from advertising on campus or receiving other benefits (this was the case at my school). If neither of these solutions work out then we can discuss what other options you may have.