Bad bad bad service

So I made an cellphone contract applicant last year around November, received confirmation on the 11th of November 2018. Same day I received a call from the branch to come pick up my phone, this is VODACOM absa towers north branch which is business or corporate. This was for a personal phone, I then went to the branch signed the contract I was forced due to the incident we had already to buy a Sim card which I bought. Same day they called me to tell me they are having system issues so they will not be able to activate my Sim card, but I was given the phone and all only activation was left. A few weeks later still no feedback was give, I then went to VODACOM then they told me they shouldn't have given me the phone due to score but they don't know how the system approved, they then said it's fine they will manually fix the score or vetting and activate the Sim. December I went back they still gave me the same story. So I stopped going to check, now recently I went again as they forgot about the phone situation. I couldn't have just stayed with the phone without paying but I went as I knew I have to pay the phone. The consultant told me I have to pay the phone cash, 4 months laybe which I explained I couldn't not afford that. Then they asked how much I can afford I then explained the same amount we agreed on is fine with me with or without the benefits. Now they tell me I must bring back the phone which I am not willing to do as this was not my fault, if I was not willing to pay the phone I would have not gone back to check on the status, they have forgotten about this. The manager also just wants the phone to sell it but I will not take it back as it's VODACOM fault, I am only willing to pay what I signed for that's it.