Do I have to pay my past landlord who I think is just trying to scam me?

Question Details: I moved was on a 1 year lease with 3 others in a 2 bedroom apartment managed by a realty company. When we moved in, the apartment was not completely clean, so we took pictures documenting the mess left behind. The grounds were not taken care of and maintenance never took care of issues that we told the realty company about, which we have pictures of. We moved out 1 year later and took pictures of all the cleaning, vacuuming and bulb replacing we did before vacating. Instead of getting our security deposits back, we each got a letter showing charges for cleaning and vacuuming that added up to and past our $1050 security deposit. They are now asking for an additional $250 from us. Not only do I think they are trying to steal from us but I'm pretty sure the notice they sent us asking for the $250 isn't an actual bill. I believe they are trying to scam us. This letter isn't stamped or verified. It doesn't look like an actual bill. Do I have to pay this or are they just trying to get money out of me?

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