Makro poor service

Ordered a office chair online, they stated 2-5 working days to delivery, I queried it after 4 days as there is no change on the tracking system, just to get an sms shortly after my query that it was cancelled, no reason nothing and will be refunded in 10-DAYS, if I did not query it would they ever got back to me and why should I wait 10-DAYS to be refunded if they cancelled the order