wind Mega unlimited 12€/m

[Patthecat]

Hi all,

i am in italy on and Off for the next Couple of years, Staying always for 2-3 weeks then coming back 2-3 months later, again staying2-3 weeks.....

Now, apparently what I need for IPad and Samsung Galaxy ( according to my local Wind/Tim dealer) is a WIND Huawei wifi thing for 69 €. Ok, got that.
Next, a prepaid sim card.
Here it gets tricky: he says,that on WIND mega unlimited ( currently promotion for 12€/ month !!) 1 gb/ month, there is no obligation to pay EVERY month...?
I only pay the months I am actually in Italy and load up on my prepaid card.

Once I have no credit and don't come back to Italy, there simply is no charge to the card...? Then, the month I come back, I put 15 € on the card and it is reinstated.....?

is that correct?

HELP!
Thank
P