Poor Service

I will not recommend this service. It takes this company 3 months to issue a credit note. I have called the call centre numerous times and I am told that credit note will be issued but up until now no credit note. They bill incorrectly and they can email and sms but cannot correct a mistake on their side for incorrect billing. I was only supposed to get invoiced for July (month 37) and I cancelled August. I paid both months but they insist I owe them a month for June, yet tracker was installed on 20th June and so if I did not use the tracker for a full month why should I pay a full month. I said at best a pro rata amount from the 20th to the 30th of June. Call centre agents confirm credit note will be issued but the person dealing with my account never responds to my emails, she is never available to take my call.