DSV, A Logistics company which cannot run logistics business

I have been with MTN for more than 15 years, but I will leave them because of DSV. Terrible service from logistics company which does not understand how logistics works. MTN shipped home router through DSV. DSV phoned to confirm that they will deliver the router on Friday 2nd May, between 14:00 and 16:00 slot in my workplace. At around 11:30 on Friday, I saw missed calls and I immediately retuned the call. A guy answered and told me he was on my workplace for delivery, but he was now gone. I asked him to come back since I was in a meeting and phone was in silence. The driver told me he won't be back I'll have to wait for the office to call me on Monday or Tuesday. How does a logistics company book a slot of between 14:00 - 16:00 but arrive at 11:00? How do you change a slot but not notify your client? Does DSV understand what on time delivery is? It is very painful since I have already paid MTN for a month of May and pro rata of April, but I can't get my order on time to use services. Now I had to use my last money to buy data from different network in order to get everyone connected at home. I am very disappointed by this company service. MTN has billed me for something which I don`t have because DSV can't deliver the right product on time at the right place.