I need an opinion..

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So I need an opinion on something... I just recently moved out to CA, and obviously had to set up an account with the electric company. So I called the turned the service in my name, but they wanted me to pay a $72 deposit to establish credit. Which was fine I understood that. So I paid it. It showed up online on my account it was paid and in my bank account paid. Then 2 weeks later I got an email from them telling me I had to pay the $72 deposit. So I called them and asked them why I had to pay it again, and they said the payment was returned. So I went into my bank account and it wasn't, it still said paid. So I told them and they asked me to fax them my bank statement so they could talk it over with the billing department. Well I had to send it in because they're fax machine didn't work. Now I get my new bill stating that I still have to pay the $72 deposit. And when I emailed them and asked them why I have to pay it again. They told me the same thing they told me on the phone about it being returned, which it wasn't. So I emailed them and told them that I sent in my bank statement showing it was paid what's the problem??? Now I asked my mother for her opinion and she told me that if they have my bank statement showing it was paid there shouldn't be a problem. I just need some opinions on what I should do or say to them the next time I call and yell at them again lol