Accounts query complaint

I requested for the cancelation of my Jet account on 31st May 2021. The agent I spoke to confirmed it was successfully submitted and assured me that there will be no further billing since my account had been paid up to date. I received a statement this morning confirming I owe a monthly installment. I called the call center and the agent I spoke to was not helpful at all. She just told me to go to the store, make the payment and request for the cancelation again. I then asked her to do a follow up on my previous request and she confirmed the date and time of the initial cancelation request but said there is nothing she can do to help me unless I make the payment and request for the cancelation again. How does that even make sense? Because clearly this will be an endless cycle of payments and cancelation requests. This is some of the worst service I've ever received from Jet