Elica — No technician attended for Product service for deep cleaning from past 3 weeks

I have raised a complaint on june4th, they responded saying technician will visit for deep cleaning service the next day but till now I.e. June 20th no one called and attended for service. Whenever I call the service people it’s same response from customer service call. Worst service request experience I never faced this before. I won’t recommend anyone for this chimney better to go for other brands or local brands. Worst service ever