Disappointed

Very dissatisfied with the after care service from Smeg. I have a gas top, electric oven. I needed my oven seal replaced, the technicians came out and had a look at the oven and then suggested that I replace the thermo stat and thermo motor. I initially only wanted the seal replaced because to me the oven was working fine. I paid the invoice of R3173 on 24th July 2020. I then had to follow up each week as to when they were going to come and complete the job which had been paid for. 3rd August, had no reply. 6th August again followed up - had a reply that only part of the order had been received. The job was eventually completed 26 August 2020. The oven is hardly used and is now not heating up at all! Emailed the technician twice last week, no response. Eventually got hold of him via WhatsApp. The oven is not used often, can't understand why it's not heating up a all, after being told that it will be like cooking in a brand new oven if I replace the parts. I now have been told that there is another R570 call out fee to come and have a look at the oven, which was working prior to having all the parts changed!