Pathetic service

I am so annoyed with this company cause my contract ended last year with them and a agent called me asking me if I want to continue and I refused. Till date I keep receiving SMS and emails showing that I must pay a monthly installment to Telematics. I have sent countless emails to this company telling them to stop billing me and stop contacting me cause I'm no longer a client. I am still receiving billing and being charged every month. This is unacceptable and this company needs to catch a wake up. Clearly some one is confused there. I try to call them and never get through, so I'm utilizing this platform to get a message to them to tell them please stop messaging me and stop billing me.