Poor service, please make it stop!

I'm quite fed-up with the POOR service from Netstar! Its been MONTHS now and here I am, still waiting for them to come remove the devices from my car as it is draining my battery. Numerous emails sent, reference numbers gathered, an assurance given that the contract will be cancelled as of 1 October (expected a higher debit order to go off but nope, still the same monthly deduction). I got a read receipt on the last email where I said I'll have no choice but to turn to Hellopeter and no acknowledgement, NADA.