cellphones – How can I check out the balance on my Vodafone Italy SIM card without a mobile app?

I purchased a SIM card from Vodafone in Italy, which costs €30 and includes 8 GB of data. Now I want to check the balance of my SIM card.

According to SIM card wiki Vodafone Italy offers an iOS app. But it is only available in the Italian App Store, and since I don’t like to change the store region, I could not install it.

Another source is to call 404 as instructed here, but it only tells me how much credit is left on the account, which in my case was €2.51, and does not tell me the current monthly balance on the data.

I asked a staff but she told me usually the customer checks it on the mobile app, and in the store she only told me the €2.51 credit, not on the amount of data I can use.

So is there any way to check out how many GB I can use right now?