Device is out of stock after promise that there will be stock.

About two-and-a-half weeks ago the call centre was finally open and I could upgrade to my new contract telephonically. The Call Centre agent told me that there are only certain brands of cell phones available. This I did not really have a big choice on which device to choose. I was forced to choose from the devices they had in stock so I went ahead and chose a device that he said was in stock. I phoned more than once to confirm when my device would be delivered. More than once they confirmed that there is enough stock and that I will receive my device shortly. Last week when I inquired again they said that the device that I chose is no longer in stock. So I have to wait a little bit longer for my device to be delivered. I feel that this is not fair. During this time we all use our devices to work from. Customer service is slow supposed to be first priority and using the pandemic as an excuse is an acceptable. I feel that they should keep Better record of their stock and not allow customers to order something that might run out of stock.