Poor response

Barnard’s TV and Appliances. So I am a Mastercare Client and my Sony set was sent to Barnards TV & Appliances for repair in July. The Power supply board had died. On Sunday morning, I sent them a message as the set had died again, the same symptom. Today, Monday, I contacted them to ask when the promised pick up would happen and I was told someone would contact me. (This was a WhatsApp from the owner) Well, nothing happens, I get the person who answers their switchboard promising to call back but no call happens. I called the owner and he said, all our technicians are busy today, we can come by tomorrow. In what way does this constitute service? It is still under Barnard’s repair warranty.