The totals for how many voters expressed which opinions are what carries the most sway with them. Whether or not those tallies are in alignment with the general public is not relevant.
So, when you contact them, you'll get a canned response telling you what their current stance is, regardless of whether that's the same as yours. But make no mistake, your opinion was added to the count.
This sort of thing is why phone banks and contact-your-representative campaigns are so common. In bulk, they're effective and can change policy even in ways that most of their constituents don't agree with. They're only looking at the numbers of contacts they've received.
