the national magazine exchange,clearwater Florida kept my subcription going largo Florida

this company has telemarketers calling and asking for me,for renewal on magazines so far up to date I do not know what I am subscibed to!,they just keep coming even the last time I asked one man who's name was Jeff to cancel my subscriptions!,and started asking me about my Name and Addres,telephone,and credit card number,-I asked why he said he wanted to verify if it was me!,also I requested a letter about the cancellation of this magazines,up to date I'm still waiting for a letter or a statement,never got one!,-recently received a call and started to say asking if I did remember him,all I said it's another sale,hung up,a few days ago received a letter about a contes their sweepstakes telling me that I was a possible winner,then I went on the internet and found this company has a history of ripoffs a mile long !,please add me to them and if you contact them please tell them to stop calling me I'm not interested!!!