If the unit is still under warranty, contact XSPC to RMA the pump/res.
If the unit is not covered by warranty, replacing the molex pins is fairly easy. It can be done by crimping, soldering or both. Replacement pins are available through FrozenCPU http://www.frozencpu.com/products/1791/ele-134/FrozenCPU_ConnectRight_Gold_Plated_Male_Molex_Pins_set_of_4.html?tl=g44c155s323
those should work (buy two or three - especially if crimping), you should be able to reuse the plastic part.