Elavon sucks

I recently had them close my account "for security reasons" they stole over $4000 and will not return calls nor give me any reasons.
They have my bank account overdrawn and hit me with about $250 in service charges.
Their "security department" cannot be contacted directly, I am constantly told that they will contact me, which they never do.
Any help with Government departments I can complain to will be appreciated