Virus that makes my father pay a lot of money by increasing the bill..

I've downloaded 3 different antiviruses, good ones, but they don't detect any virus, malware, spyware...
I deleted all the apps that had "SMS send" as a permission.
I still get an additional cost. I haven't used the phone at all this month and I dialed *123# two days ago(the number in my country that shows you how many SMS you have left or internet or additional costs) and I had 0.14 euro additional cost. I checked it today and I now have 0.28 additional cost. WTF

I also had 0.70 additional cost last month without doing anything for it to happen, which is suspicious, BUT also my father said that he paid waay more than just 0.70 euro in addition to the usual amount of money he pays for my bill.

I have a Sony Xperia Acro S, I bought it in december 2012. I made a backup back then, would it do something? How do I get rid of this? I'm afraid my father would have to pay even more if I don't do something about it.

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