Unauthorized collections

Horrible customer service, this insurance company decided to replace my device with a cheaper device and payout the difference. Collected first premium and cancelled my policy without notifying me. Only when I wanted to claim did they tell me the my policy was canceled due to the payout that happened. They than decided to reactive my policy and collect all the pro-rata debits also without notify me, after I clearly told them in countless emails and phone calls that I'm not willing to pay all the pro-rata installments as the decision to cancel my policy came from them and I was not notified. They sent an instruction to collect this amount on my account and I did not agreecto this.