Online order undelivered

I placed a online order for a Samsung S8 about 3 and a half weeks ago... In which I was told it would take 3-10 working days for the order to be delivered after a week I called to enquire what the delay was and I was told mtn is changing it's courier company and the order would be delivered soon.. A week after I got a message saying the order would be delivered on the 8th of July and since then no further communication has been made and every time I try to call customer service the lines are busy..so i decided to go to a mtn store and find out what's going on, the sales rep said it's takes awhile for deliveries to be made. Honestly I think it's really pathetic that no further communication has been made..A full month has gone by since I placed the order... ridiculous Mtn has lost favor with me and has caused a serious inconvenience for me