Daniela
I have just had broadband, including a landline, installed in our apartment in DV. I went to the Telefonica/Movistar office in Sabinillas (just down towards the sea on the left coming from the main round-a-bout where Barclays Bank/Supersol/Bernardo Munoz is). It took four working days, basically! They were excellent. Called me first (on my mobile, obviously!) then came round, installed the wifi router, explained the telephone connection and we were off. I bought a cheap phone for the landline from Carrefour and it works fine!! They're doing a good deal at the moment to include broadband, too.
I'm also relocating to DV for a while, from Dubai, aim to be there at about the same time as you! Mid-September. If I can help in any way, just PM me.