My question involves landlord-tenant law in the State of: California
(deposit amount = $1250.00)
I was not able to live with my roommate anymore based on trust issues, and she was trying to control the whole apartment. 3 months later I put in my "Notice of intent to vacate" to the property management company. I signed a letter stating, I___________, no longer reside at ____________ address and relinquish all interest in the security deposit on this premises. After signing this with the apartment management company, they gave me 21 days to vacate the property. I left my room in excellent condition, and I've taken multiple pictures.
Now the problem is that I verbally communicated my ex-roommate that I am leaving Aug 31, and I want my share of the deposit back since I paid half. I told her because you are trying to control the place, you are loud, and I can't trust you.
She is still refusing to return my deposit and she is seeking advice from other people in regards to this issue.
I spoke to a person at the property management company, and that person told me we must work it out between ourselves. The person also sent me a letter having a few options to resolve the issue. After reading through the email, it gives us a few options.
1 of 3 choices;
1. I move and you find a replacement. I understand I will pay 163.00 for the new roommate's credit check fee, and the process of the paperwork. However the new roommate must pay their share of the deposit.
2. We both move out and we pay the $325.00 penalty for the company to replace the both of us, and the new person/s credit check and application fee.
3. We will have to settle this in Small Claims Court.
I have all my receipts showing that I paid my share of the deposit.
I clearly told her I'm moving so decide if you're going to stay here, or we both leave. If you stay here you take responsibility to pay your own rent.
However she is still refusing to pay me. What should be the next step I take?

