Bad advice without ownership. No feedback

I wanted to renew my contract and visited the Vodacom shop at Centurion Mall. On the first visit I requested a contract with the huawei P8 lite. Iwas advised they do not have stock and they will contact me when stock comes in, this never happened. After two weeks of waiting I returned to the store and was assisted by sales consultant Wayne. He advised not to take the P8 lite as there will be no more software upgrades on it. His advice was to take a contract with a nokia 3 instead. I had a P8 lite on my previous contract and never had a problem. After two and a half weeks the phone was on a black screen and would not switch on. 30 minutes later I was able to get it switched on. Thinking I had done something . A week later, same problem except for half the day I could not get the phone on. I asked my son in law to see if he could activate the phone, but he too was not able to. The next morning the phone was working again. My son in law read on te internet that this is a problem with the nokia 3, one of the complainants even had his motherboard replaced. But still had the problem. I returned to the vodashop to request them to take back the phone and provide me with a contract on another phone. There firt response was to take the phone for repair. My son in law explained the problem others had experienced so they sent us to one of the managers. I explained the problem to her and after all the explanation, she said that she will speak to one of the store manager working on the Monday to see if they can do a reversal. She took my contact details and promised to call me today(Monday). I have waited all day with no call from her. I am an elderly lady and need a reliable form of communication. I have been a client of vodacom for many years and have never had such bad service. I am very disappointed .