7 Weeks later and still nothing.

7 weeks ago,my cellphone decided to go on the fritz. So,since it's still being paid to Teljoy and it is insured with them, my husband contacted them and they came to collect my phone. Fantastic. They contacted us the next week and said they would have to order another battery as this was the issue, no problem and we left it at that for a month. Then we got told a battery had been ordered and received and it would be returned to me soon, which it was, fantastic.. I received my phone in a plastic packet and it looked horrible. The back cover was not in place correctly, it had been scratched bad in 2 places where they had tried to lift the panel. There was bits of glue sticking out the sides and it was just grimey. No matter, I over looked that, just too happy to have my phone back. I switched it on and it was on 23 percent battery. Ok, maybe they hadn't charged it. I started going through my phone and it was still freezing, not going into apps and in a space of 7 minutes it was boiling hot and battery dropped to 13 percent. Contacted Teljoy to tell them it doesn't seem anything was done to it and they would send a technician to collect it. My husband then saw what my phone looked like and lost his mind, being an IT Technician himself, he couldn't believe the state the phone was given back to me. He contacted Teljoy and Hisense and teljoy was very apologetic, asked us for photos of the phone and told us it was an error on their part and they would send me a new phone. They told my husband which phone it would be as he wanted me to have the same specs as what my current phone had, since we are still paying for the phone.... This is going on into the 3rd week and he phones every day and every day they say they will collect the phone. Oh I also forgot to mention that when they collected my phone the first time I gave my Hisense charger with and when I got it back,I had a Lenovo charger. So I am deeply upset and wondering if Teljoy will just string us along till my phone is paid for in November and then it won't be there issue anymore or what? I was always so impressed with everything they did for my husband, until 3 weeks ago.