TLScontact unhelpful and nonprofessional

The TLScontact center was absolutely unhelpful in assisting with my UK visa application.

I have made an appointment via the website, however, the website was not and still is not working properly and the appointment was not finalized properly. But this information is not conveyed across,

When I walked into the branch in Port Elizabeth they said I do not have an appointment even though I showed them the screen capture from their website. Then they were not willing to assist me and said it is the website issue. So what am I suppose to do ? Their issue, but my problem. Very unprofessional.

Then they charge me an additional R 1600 as a walk-in fee. So their system does not work properly, but I am penalized.

There is absolutely no way one can complain on their website and the requests are ignored.

Really bad and unprofessional.