I had a relative agent help secure tenant. Commission paid but follow up on complaints was poor - was told to put up with minor issues as long as they paid the rent on time.
Took over the job myself after the tenancy. Upped the rent over 10% over the next two renewals to compensate for issues.
Actually not too difficult to do most of the follow up work myself. But I will still engage agent and pay for their services in securing tenants for consideration.
It's tough being an agent in current market condition. No need to blacklist but just be aware of the patterns that some of them shows. I also called to buy a property several years back but was told landlord overseas for months on end. In the end also never got back to me. But there are many possible reasons, must give others the benefit of the doubt and chance. Who knows if we need that chance someday?
The three laws of Kelonguni:
Where there is kelong, there is guni.
No kelong no guni.
More kelong = more guni.