Truma water pump

Does anyone else think that the water pump supplied by Truma to Bailey Caravans (supplied with my 2016 Pursuit) is not very good?

From it's very first use mine has constantly needed fixing as the flexible water hose that fits to the assembly that makes the connection to the caravan, keeps coming off. Consequently our water barrel empties at twice the normal rate because half the water supplied by the pump ends up on the grass. I have to unclip the top and re-fit the hose clip frequently each time we go away.

I wrote to Truma, but they appear to be unaware of the poor design of the product.

I even tried a different hose clip, but this has not worked, although it is better than the original.