Policy cancelation was never processed as per my request

I've requested for my avbob policy to be cancelled through the phone in February, they told me to send an email instead, I sent an email and they said I must write a letter. I wrote a letter and scanned it to their email and they still have not responded, in fact they had a nerve to debit yet again in mark the 25th. I am so frustrated and disgusted by the way we are treated by this company. The person who once rep**** to my emails was Shaylon Martin but he did not help me at all. I don't want this policy anymore and even if an employee from avbob was to convince me to keep it I wouldn't keep it again because of their ****ty service and lack of customer's respect.