Hello
The best Wi-Fi provider in GA is
GA TV
They offer holiday package
It is cheap and it works
If you arrive in the middle of the month you pay for when you arrive and 1 month forward
So you will get 30 days from the day you arrive
I pay 27 euro for a month
you pay for the installation
and then only when you are in Gran Alacant
They have there office right beside the street marked in upper Gran Alacant