Cancelation a Terrible Experience for Online Buyers

So I have been using the MTN unlimited router for the past few months with no issues... However, I recently moved and unfortunately the place I moved to has no coverage. I managed to cancel at the point of sale online where I was advised to return the router to an MTN store to finalize the cancelation. Yesterday, I went to a store in Evaton Mall and they told me that they are franchise and did not process returns of online bought routers. Today, I went to the store in Vaal Mall where I was rudely told that they will not be taking my router because their warehouse is closed and I should come back on the second week of Jan in 2025. How is this even a response from such a huge entity? I have already paid for nothing for the month of December and I need to wait until I pay for nothing in January again. This is such an inconvenience and terrible experience for an online purchaser.