Extreme bad service from a Telkom technician

Good day, On Friday 12 Feb 2021 my wife logged a call with Telkom to have our wifi coverage checked at our business house in Brixton, Johannesburg. We have a challenge that internet coverage is poor in other areas of the property. My wife informed the Telkom call center agent that they should alert her prior to sending a technician to the property so that she can drive to the place to meet up with him. On the contrary, the technician was dispatched on Tuesday (16. Feb 2021) morning without my wife being informed as she had requested. Consequently, when the technician gets to the property, only our tenants were present and gave him access to the router. He then went on to checked the internet and left the house. Later the same day my wife and I get to our business house only to be informed by the tenants that the wifi had stopped functioning immediately after the technician left the house. After the tenants informed me that the technician left his mobile number I then called him and the time was 17:14. The technician answered the phone in a rude manner, telling me that I called him after working hours. He did not even give me an opportunity to engage me on the issue that I called him about. While on the call with him network disrupted the call and the call hang up. I attempted to call him twice immediately afterward to no avail. I immediately followed up with an SMS informing him that I could not pick up his conclusion due to a bad line. He never bothered to return the SMS. This morning, Wednesday 17 Feb 2021 at 09:38 I gave him a call to which he answered. I asked him about my yesterday's call to him and why he failed to return neither my calls nor SMS. He still reiterated that I called him after hours and when i asked him why then he could not return my calls in the morning during working hours, he failed to answer, and instead he lashed at me and shut the phone down on my ears. After he hang up the phone on my ears I felt disrespected as a customer and failed to understand what it is that I have done to deserve such utter rudeness when I merely asked to be assistance with a service that I am paying for. The technician's full name is Retish Singh and his mobile number is ***. I am including his mobile number for identification purposes only in case there is more than one technician with the same name at Telkom. Ref number for my incident at Telkom is 48CRK120221. This is one of the many bad experiences I have received from Telkom after being their client for a long while now and I have even decided to shop around for other service providers and cancel my accounts with them. I would humbly like for this matter to be escalated to Telkom customer service so that the technician can account and be disciplined for what he did. Kind Regards.