Other than calling and emailing - have you tried to FAX a letter to management? This also might generate a response from the company.
Unfortunately, this situation does need to be addressed directly with the management company.
Arlynn B. Palmer, ESQ, SRES, CBR, CMS, CNS
Assoc. Broker, REALTOR
Coldwell Banker Claire Sobel
(516)621-6300 x 205