It sounds like you have a case against your landlord for wrongful retention of a residential security deposit. You do not have a case for defamation of character. The landlord's conduct also does not rise to the level that would justify pain and suffering (this is more like annoyance and irritation).
Security deposits for residential leases are governed by subchapter C of chapter 92 of the Texas Property Code.
A landlord must return a security deposit, minus any deductions for damages above wear and tear, within 30 days of receiving written notice of the tenant's forwarding address. The landlord has no duty to refund until that notice is given. You did not specifically say you gave your landlord your forwarding address. You should be prepared to prove that you gave notice in court. I recommend sending the notice of forwarding address via certified mail, return receipt requested. It only costs a few bucks and it is really good proof.
A landlord cannot deduct for normal wear and tear. A landlord has the burden of proving that any portion of the security deposit they keep is reasonable if you take this case to court. However, your case will be much stronger if you have pictures of the residence at the time of move out.
A landlord who retains any portion of the security deposit in bad faith is liable for $100, triple the amount wrongfully retained, and reasonable attorney's fees.
More help: http://www.housing-rights.org/PDF/forms/Security_Deposit_Refund.pdf