Yep throw more money into the fund. Give it to an anonymous fund manager who is apparently smarter than all of us who will invest it in a mix of equities and debt that you haven't a clue about. In good years you make a return and he makes more, in bad years he takes his fees and dilutes your capital and then has the audacity to write to you telling you that you need to top up your fund due to adverse outside market forces. Keep doing this for years in the hope that one day there will be something waiting for you on your retirement. By this stage the retirement age will be 80 years and any cash that has been saved will be the subject of various exclusions or adverse tax so it won't be anything like what you signed up to back in year 1.
What sort of return are they getting these days anyway? 5-10% in a good year, 0% or worse in a bad one?? Putting your cash on deposit with someone like ING will give you 4% flat. Alternatively buy rental properties and let someone else pay your mortgage and deduct some tax along the way. Then cash in the property when you want to retire.
But giving your hard earned to someone to invest on your behalf - that ain't for me.