No service on brand new Defy C450 fridge

We bought a new Defy C450 Fridge Freezer on 18 July 2018 from Pick n Pay Carrie Glen which was delivered on 19 July 2018. The fridge was installed and appears to work fine. Every 20 min or so the fridge makes 4 successive beeps. The doors are closed properly. The beeping never stopped with 20 min or so intervals. On 24 July 2018 I made a call to the Defy National service number after I 've spoken to the Service manager of the Pretoria service centre who suggested I do so.I actually wanted to speak to a technician to establish if it's maybe something simple like a setting which didn't require a service call. I stated to both the Service manager and the call centre that it's a brand new appliance not even a week on my possession. I received a call number 943155 together with a message that I'll be contacted soon to arrange a visit time on 24 July. By Monday August 6 I've received no calls or any futher correspondence. I called the natiobal service number again who said they'll chase the call. I also called the Pretoria service centre again and once again spoke to the manager and asked to speak to a technician. The manager said he was surprised that no one had called or visited me yet but it will be better off a technician came to my premises. He took the call number and said someone will call me soon. Today is Friday August 10th and still no call or visit. I called the national service number again. The consultant said that a technician will come to my house on Monday August 13th. I then said that no one will be at the house on Monday and asked what happened to the call to arrange a visit. The consultant then said the technician will call me on Monday. I then asked what the delay was as it was reported July 24th and it's a brand new appliance. What happened to service?? Then the consultant Then said that the technician was waiting for parts. I then asked what parts as the technician hasn't even seen the fridge yet. It just all seeams so careless. Why couldn't I initially speak to a technician and maybe resolve the matter on day 1. Why doesnt it take any form of priority if a client reports a problem on a new appliance which shouldn't be faulty to begin with. Surely I can get this fridge replaced with a brand new one as I have reported the matter within 5 days of delivery. I am not a happy Defy client.