Optimum Online Cablevision optimum won't answer my calls Oakland New Jersey

I have tried numerous attempts to contact Optimum by my cell phone and every time when I'm about to talk to an Optimum technician the call is dropped. All I want is to have my newly purchased modem registered and installed on Optimum online internet system. My cell phone works perfectly. I feel that Optimum is upset with me because I cancelled my Voice service. I believe Optimum employees are taking revenge on me by harassing me by disconnecting my phone connection. It is too much a coincident that my cell phone appears to not work only when connected to Optimum Employee and only "AFTER" I disconnected my Optimum phone service. This is a foul, malicious, and childish act by there employees. I want them to stop the harassment and DO THEIR JOB!