Or you could just do your job...

We elect our MP's supposedly to represent our interests, unfortunately as happens often enough our MP's simply represent their own or their parties interest. Doesn't even matter if they promised it in a manifesto, after all, the Labour party via a court case made certain that manifesto promises were not subject to legitimate expectation. In other words a politicians promise isn't worth the paper it's written on.
Mail.

David Cameron is facing renewed pressure to hold a referendum on Britain’s membership of the EU after Germany said it would let its people have one.
German finance minister Wolfgang Schaeuble said yesterday that closer integration in Europe could only go ahead with a ‘yes’ vote from the German people.
Later this week, the EU Commission will press for closer banking union at a summit in Brussels in a desperate bid to raise market confidence in Europe. The plans, which represent a step towards a European banking super-state, include an EU-wide guarantee scheme for bank deposits and a single bank regulator.
In an interview with German newspaper Der Spiegel, Mr Schaeuble acknowledged that a referendum would be needed to cede national sovereignty to Brussels.

If you think that the EU will allow any result other than the one it wants, then you're seriously deluding yourself. If you think that a politicians word on a referendum is truthful, again you're seriously deluding yourself. The EU only permits referenda that it thinks it will win and then orders them held again (and again) if it doesn't go their way. Once it does, no more referenda (of course)
What we need is a government and a set of politicians who have the balls to defy the EU and tell the country if you elect us we'll take you out of the EU, a parliamentary vote not subject to EU bribery of the populace.
Frankly if Cameron allows us a referendum on an in/out vote about the EU it will only be on the grounds that he expects it to be an 'in' vote, he'll also campaign for one too, mark my words.
What the people want and what a politician will give them are two seperate things entirely. We know this all too well.