Bad service & Bad repairing technicality

Extremely disappointed in the service and approach to fixing my Samsung one connect box.

After being referred to MM All electronics by Samsung Clearwater, I took my one connect box to be repaired as I wasn't sure what was wrong with the box.

After the technician at MM All electronics opened and assessed the box, they advised that the mother board needs to be repaired so I told them go ahead. They replaced the board and I paid 8,5k.

When it was ready for collection I asked them if I can see if the unit is working and they said they don't have a TV to test the unit. We then tested the unit at home and it's still not working and now there are other problems.

I took the unit back to fix the second time and asked if they 'really did change the mother board' and they said yes they did. I said but then why is it not working, then they blamed it on the tv itself which we tested another one connect box and it was 100% working and in order.

I told the technician to relook & check the unit once again. Once he was finished repairing the new mother board I asked again, if I could check if its working in store and he again said they don't have a tv to check if its working or not but assured me that it was working.

Once again we checked the unit at home and its still not working. I then reverted back to them and they kept on coming up with excuses that its not the unit but the tv.

I told him I want money money back and they refused to give it back.

I'm extremely disappointed as now I'm still with a one connect box that is faulty and a 8,5k loss.

How can you be a service repair centre, without having the correct devices to check if the faulty units are working or not? Not professional at all.