Customer care/call centre absolutely useless

I app**** for an upgrade online, 3 days later, sorry no stock please give us a call at *** to cancel or change my order. Calls them. Can I please do an upgrade in store? Response: No sir you have to cancel 1st, gives me a number to cancel. Calls them. Hi i please want to cancel my online upgrade and upgrade instore.. sorry sir you must call this number. Okay can I maybe change the order, sorry sir you have to call this number. Calls them.. waiting endlessly for no one to answer or help. Proceeds to call a store number, can you please assist me? Sorry sir you have to call customer care and cancel. This place is Absolutely utterly useless. How in the world is this place still standing with so many *********** people working for it!!!!!!!