Poor Service

I went into an agreement with cartrack to get a tracking device on my car and they promised that the fitment team will reach out to me in 48 hours to schedule a fitment appointment. After 48 hours l tried to contact them via email and phone call and did not get any response nor feedback. Later on, the same salesperson who facilitated our agreement phoned me and promised to make sure l am assisted. Surprisingly it's now a week and still no response. I wrote them a final email and asked them to cancel the agreement (still no response) and l have a tracking device installed already by a serious company. I hope they won't deduct or start charging me for a service they failed to provide.