Cold swimming pool water

Within the last 2 months the pool has been so cold on occasion that it is not possible to swim. The management's excuse is that the booster pump is broken. I've measured it with a calibrated thermometer and it has not been above 25 degrees Celsius for the last couple of months. I have discussed it with the manager but the water is still very cold. As a paying member of the gym and Discovery Health, I find this unacceptable.