Breach in Sprint financial records

In the past month my Sprint account has been comprmised three separate times. I have contacted customer service, finance, and fraud and no one can tell me how this is happening or how to fix it. First I was told that someone had hacked into my Sprint online account. The hacker charged over $1,000 to the credit card on the account in Virginia. I completely changed all the information on the account and hoped for the best. NOT 3 days later, the same email and text came across wherein my pin, security questions, account number, and all info was displayed, again without my request. I immediately called Sprint only to be told that it was an incorrect telemarketer. (YEAH< right). This time they tried to charge the same credit card, which had been deactivated. I called back and shut down my online account and asked for my entire Sprint profile, credit cards and all, to be wiped out. I was assured this had been done and I would not have any problems. The woman suggested I upgrade my home router, siting this as the breech, not Sprint. Well, that peace lasted until Sunday when Visa called me asking if I had charged $10,000 in Virginia. WHAT! After this call, I contacted my family (we have a family plan) to check their credit cards. Later that day, someone from the Phillipines calls me, supposedly from Sprint. There were roosters in the background- I was skeptical. She asked me if I charged $15,500 in Sprint fees today. WHAT! After a long process of explaining to this woman that I did not and I refused to give her my credit card number, I hung up. Two minutes later another man called me. Again, roosters in the background throw me off. He said if I did not give him the whole credit card number, so he could "back-off" the charges, there would be nothing else I could do. He told me the last 4 digits were x, y, and z. I told him there were no credit cards with this pattern. He was not responsive, did not understand my fury and barely spoke English. So, I hung up and called *2, hoping for legitimacy. An hour later, I find out not only had they tried my credit card (that was supposedly removed) for $10,000, but got my brother's card (also, supposedly removed) for $15,637.41! Not only did Sprint never wiped out my profile, they never had the fraud department follow up on the original complaints.