STILL NO ASSISTANCE! PATHETIC

My phone went in for repairs 26th September, I got a loan phone that needs to be charged every day. I was promised an upgrade on my old phone as they could not detect what the problem was. I got a call to collect my new phone, on arrival they offered me a J1 ace which sells for R1499.00 which I refused as I paid R2100.00 for my phone. I was promised the same phone or an upgrade NOT A DOWNGRADE. I phoned on 8th December to enquire when I will be getting my new phone, I was then told to collect on Saturday 12th December. On my way there I received an sms that the phone is not there, they will deliver to me on Monday 14th December, nothing happened. Today the 15th December I have been trying to phone the whole morning and cannot get through to the Manager . I left several messages for him to ph back with no luck.