Unresolved issue

I phoned Santam regarding a geyser claim and was confronted by a useless AI voice prompting machine for about 5 minutes before I actually got to speak to someone. The lady I spoke to was pleasant and handled the initial part of me claim professionally. I explained that I still had hot water however there was noises emanating from the pipes up to the geyser and I suspected that it was possibly a valve, or something associated with the geyser the geyser had been replaced about a year ago. A plumber was dispatched, and he advised me that it was the pressure regulating valve that is faulty and that the geyser is under warranty still with Kwikot. Later Kwikot attended to the problem by cleaning the filter in the valve and implying problem solved after opening a tap. shortly after they left when I tried a tap the noises had returned. I reverted to the email correspondence received from Santam and have just had a run around. Kwikot sent a message for service feedback to which I responded that the issues have not been resolved. I don't believe they take note of their failures - only the favorable comments. (I have also posted this under Santam) Kwikot has not responded to the unresolved issue.