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You do not have a breach of contract ase unless the contract provides that billing would be accurate. My guess is that the contract just specifies that billuign will be monthly. You may be able to sue Sprint for negligence with respect to its billing practices. You may also be able to take Sprint to small claims court toi get a refund for all erros in thyeir billing. With a pattern of continued errors you may be able to get relief.
Your better option is to write the president of Sprint. Send copies of your bill and describe the errors and corrections made. This may get you a "better" deal then dealing with customer service.
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