JPMorgan Chase Credit Card Complaint

JPMorgan Chase Credit card department,

Billing disputes California

I called Chase Credit Card company on -/-/2015 that I wanted to stop any further charges from -. I told them that I had originally authorized - to use my credit card but now do not want any further charges from them placed on my account because I was paying them by other means. I was told a " stop pay block '' was placed and no further charges will accrue. The next billing cycle I had another $100.00 charge from - and I called Chase Credit Card company on -/-/2015, repeating what I told the last representative, to advise them of this unauthorized charge that I was paying by other means. The representative, -, said I should have disputed the charge and that she will dispute the charge, that I will receive a letter that I have to sign and return in order to do so. I never received the letter. I received a phone call today from Chase saying that my account is past due. I opened the statement I received yesterday -/-/2015 and there is another charge for $100.00 against my account. Now I am waiting for a very busy medical practice to call me back which is precisely why I simply wanted their access to my account deactived until I had another appointment with them. I have never received anything from Chase for me to sign to dispute this charge in order to stop this cycle of charges according to their rules. I would think two phone calls verbally requesting this would be sufficient. - - only requires one phone call to settle such matters ... for them my verbal authorization is sufficient.