Pathetic service

I have been struggling for a period of 3 months with Hisense. A Technician ordered parts for my fridge which I supposedly damaged according to the delivery people from Hifi corp. It's been 3 months and I am still waiting. When the Technician finally I app**** for a credit since there was no feedback, now there is an issue with this as well. According to the store the serial number they provided (Hisense) does not match the unit. I am so fedup with Hisense I do not have words to describe. I had to constantly follow up on these parts that were ordered, I have been promised numerous call backs and to date I have not received not a single phone call. I do not believe the level of unprofessionalism that I have had deal with, it is unbelievable. I just spoke to a Lucinda, she is another one who has promised call backs, I spoke to her today she was so rude and unprofessional I was shocked by this. I asked to speak to her supervisor because I am fedup of this service, she told me rudely why I want to speak to her supervisor. Again she said she she will get her to call me and I know it's not going to happen. What must a person do in order to get service at Hisense? Honestly what kind of a Micky mouse operation are you running. I strongly use to believe it your products but after this, whenever I see Hisense I just get disgusted. Can somebody please please sort my issue out. After this I never ever what anything to do with this company or your products. Your service is pathetic