Disappointing Customer Service

Good day. I have been a client with you for more than l0 years. My contract expired in Sept. I am being billed. I have in the interim installed a Netstar tracker. I would love to stay with you but you don't respond to emails or queries or calls. I need my tracker and panic button to be updated. Panic button is literally hanging on its wire. You guys done respond to any communication. Your after service is poor. I shudder to think what would happen should I be in need of this service. My account is now in arrears with you. I don't want to pay unless I know what's happening with my account. I didn't request a renewal of contract yet the bill is accumulating. I have changed insurer's I have emailed asking more than once for a fitment certificate to produce which Netstar has provided. I am extremely disappointed by your customer service!!!! Who manages your emails and website enquiry forms?!?! Very very bad