My question involves landlord-tenant law in the State of: California

I'll try to make this short.

I lived in a house with 4 other friends(guys). 1 of the friends parent's owned the house. We had a few parties and by the time I moved out there was some significant wear to the carpet, the walls had some scuffs and the grout in the kitchen was pretty dirty but cleanable.

I moved out on May 7 because I graduated and got a job far away. My room was still in decent shape except a few marks on the walls and I shampooed the carpet myself so it was good. The landlords came and did a walkthrough of my room and said it was fine and that they would only charge me $50 to paint the room and refunded the rest of my deposit.(I later found out that I should not have been charged for paint at all if it's normal wear and tear).

However, the landlords were very displeased on the condition of the rest of the house since it was basically new when we moved in (3 story tract home) but they didn't charge me for the condition of the rest of the carpet or the marks on the walls in the rest of the home.

In the couple of weeks following my move out the other roomates decide to move out and were scheduled to move out June 10 which they did.

I talked to the landlords son yesterday who tells me his Mom had tried to send me an email regarded a "balance due".

I'm forwarded the email which says how much they have paid to clean up the house including painting, carpet/tile cleaning, house cleaning and trash removal. This totals $2225 and it says I owe $445. So now I'm in a awkward situation.

How can I owe money when I moved out a month and a half ago, they refunded my deposit AND I paid $50 for painting? I don't think I should owe anything. If my friends had decided to occupy the house for 6 more months and then moved out I would laugh if they tried to make me pay 6 months after I had moved out. They must think since its only been a month and a half then I should still pay well I say that's BS.

rentlaw.com.:
How much time does a California Landlord have to return the deposit?
After you move out, a landlord has 3 weeks to return the security deposit or send a list of how much each of the damages cost including all receipts. A landlord can only charge a tenant for unpaid rent and for fixing damage, not normal wear. The landlord has to prove that the repairs are necessary and reasonable and must provide you with receipts for those repairs.

I was already returned my deposit and even if they still had it at this point they couldn't charge me anything since its passed 3 weeks right?

also:
A landlord can't make tenants pay for painting, new carpets or curtains, unless there was serious damage. The landlord is allowed to deduct the cost of cleaning if necessary to put the unit back to the same level of cleanliness it was in at the time the property was leased (less reasonable wear and tear).

So I definitely shouldn't have paid for painting my room. At best I think I should have only had to pay for carpet cleaning for the rest of the house which was only one set of stairs and a small amount on the second floor where it connects to the rooms since the downstairs was tile and the 3rd story was just another room occupied by a friend

Please tell me if you think of this ordeal and whether or not you think I should pay. Thanks!