Mtn and DSV shoddy service

My blood is boiling at the shoddy service from mtn!!! I ordered a laptop as an additional contract from mtn on 25/09/2020. Today i missed a call from DSV Couriers and then received an sms saying they were trying to reach me to arrange delivery. I called them back but apparently none of the agents were available. I called back about 2 hours later,only to be told that the address i gave them as proof of residence is not the same as what they have. I was told to call mtn so that they could correct it,and only then would they release the device. I spent another 20 minutes on the phone with mtn. First i ended up at the billing department,but was then told to go to the retentions department. I held on forever and had to cut the call because i'm at work. While i was holding,an sms came through from DSV saying they're trying to contact me to arrange delivery. Nobody from DSV even called me,except for the missed call in the morning. Someone at Mtn captured my details incorrectly. I now have to sit on the phone trying to get my laptop and being sent from pillar to post. I can't do this all day while i'm at work. This someone captured my work address as my proof of residence. I have my billing address which appears on my statements,and my delivery address is my work. I've been with Mtn for about 13+ years and seldom have issues. What angers me is that i have to sit on the phone going back and forth (WITH NO JOY FROM THE SERVICE CHAMPIONS) trying to fix their error A service champion would say '" Mrs Bennett,let me try and help you" This might seem petty to some,but for me customer service is huge. Nobody is actually helping. My laptop won't be released until someone's error is fixed and i can't reach the people who has to fix it. In September i received my new phone and had no issues with delivery. CAN SOMEONE PLEASE ASSIST A RATHER FRUSTRATED,IRATE CUSTOMER?