Home assistance sent unprofessional plumbers

On the 7th of June I called up the Home Assistance call centre for help with a blocked drain. They sent out the plumbers to my house, but they did not come prepared - they only had a rod with a disc at the end. Each of the two guys, all they did was insert this rod in the two drains that were blocked when it was obvious the problem was further on down the line. So, they did nothing, and they said someone at their office would contact me. There was no response after an hour, so I contacted a plumber who unblocked the drain for me. Since then I have been trying to get some kind of a response from Old Mutual regarding this incident. When you contact their call centre, the agent just says someone will contact me, but nobody does. You have to repeat the whole story each time to a diffrent agent whenever you phone. How could the plumbers not come with the correct tools even though I told the agent that the drain was blocked - very unprofessional, and time-wasting.