Deacthalon - Utter incovinience disappointing customer support

On ** I placed order for some of my items by decathlon app. On **th I called the customer care to change my number as one digit went wrong. They assured it has been done and will take * days to reflect and deliver items but I didn't get any call. I again called them and they said it will be delivered on the same day. Next day I called them again, and this time too they assured and took my contact number. After which neither I got my items delivered not even serious response instead I am recieving plenty of calls for stock market investments. Very shameful service and rectification. Finally I have to withdraw my order. And they seems to be mocking on calls as if they were enjoying rating them after listening to the issue. This sort of behaviour isn't justified.