Shocking service and repairs

I am appalled by the service that Smegg has offered to repair my Oven. Our oven did not switch off and we logged a call with Smegg. They then referred us to a company called Homesafe for an external technician to come and do repairs. It took weeks to get the technician out to come and assess the problem. Finally after parts arrived, the technician from Homesafe failed to contact me to confirm when the parts will be installed. Eventually in January he came out to do the "repairs". A few days after the repair I noticed that the oven was still not functioning properly. I emailed Smegg as well as Homesafe to come and check. Weeks and weeks and many phonecalls and emails later Homesafe once again failed to set an appointment to come out and do the repairs. I made a phonecall to Homesafe and the receptionist / admin lady put the phone down and called for someone else to assist me, in the meantime she shouted that she couldn't deal with me any more. I then suddenly was put through to another person who was supposedly the 50% director of the company. He informed me that the technician that was supposed to come out, is the other 50% Director of the company after I requested to escalate our query. Its absolutely shocking that you have two Directors and a very rude receptionist running a company like this. The level of professionalism was absolutely shocking. After many phonecalls and a huge frustration the technician came out days later and said that a new part needs to be ordered and left yet again. This was almost a month after struggling to get them back to our house. No communication from this company was received whatsoever. I then queried what the problem was and Smegg informed me that the thermostat that was ordered was faulty and that they would have to order a new part and replace the once that was installed. Again after many phone-calls and emails, I got a response from Homesafe to say that they will install on the Thursday. Thursday came and went and no technician arrived. No phone call was received either. I then called again the Friday only to be told that he would possibly be here on Friday late afternoon. So we wait yet again.... I have never in my entire life dealt with such incompetence. How is it possible for a well known company like Smegg to use such bad external companies to fix their client's appliances??? I find it shocking and will not recommend a Smegg appliance to anyone as the repairs / services are shocking. Smegg has not done any follow up nor escalated our issue in order for the query to be resolved. As things stand since December .. I still dont have a working oven!!!!!!