I knew it seemed too good to be true. A month! I have a serious internet addiction to feed. We'll have to see if a gatuidad might prove helpful. If not, there will be a spike in business at a local bar with wifi.
When you finish with the main office in PP you will have a contract with a name and number on it. In Sosua there is a Claro Tower in El Batey and a lot of trucks with workers there. Grab one of them and tell him you are waiting for installation and you will give him say 2,000 pesos to install the internet and show him the contract. Watch how fast you get installation then.
Worked for me, should for you also.