Poor Customer Service

I ordered a mattress online with delivery expected within 5 to 7 days. After 7 days I phoned to find out what was happening. The person I dealt with said that the internet was slow and that she would phone me back. After 2 days I phoned again as I had received no update. The system was again slow and I was again promised feedback to no avail. After another 2 days I phoned again to be told that the system is slow today. I was then told that the supplier would deliver next week and they would then deliver the mattress I ordered to me. I don't understand why when they have supplier issues they don't send messages to indicate the delays.