extra charges on my sprint cell bill?

I just got my cell phone bill and saw that i am charged an extra $30 for long distance charges that were made to jamaica.
I was surpriced beacuse i never made any called to jamaica not do i know anyone from jamaica to call.
I tried to talk to customer service and they are giving me the run , they told me they will check it out.
what can i do bettier to have them take this amount off my bill beacuse honestly i did not make any calles to jamaica. i dont want to pay for it
any good sujestions please....thanks

Well if you are not getting anywhere talking to the person that you are talking to then you should assk to talk to a manager and then tell then what you have told us. when i had sprint they did that stuff to me all the time.