Makro ending my day in misery

I just received an invoice for a laptop bought at Makro Germiston. Needless to say I nearly got a heart attack because I am in Mpumalanga. I call the national call centre and they couldn't help me, just game me Germiston shop number.

I then called Germiston Makro and started holding on...Although I was first inline after what seemed like forever gave up as my call charges were accumulating.

Why does a shop liek that put me into this stressful situation. I am now worried somoene bought on my account with money I really don't have. The invoice number is 689.

I am so worried now.