Makro Online

I had bought goods online on the 23dr of August and I received an sms saying that I can come collect as from the 30th of August I drove almost 2 hours to get to the nearest Makro where I selected the goods for collection when I got there I took the box and left. When I got home opened the box it came to my suprise it wasn't what I had thought I was ordering. I recheck my order I clicked on the wrong thing, my mistake, I admit. So I called Makro online to ask of it's possible that I return it at the Makro in Cape Gate and take something else I was not looking for a refund they then said yes it's possible gave me a number of that specific store to speak to the manager phone was ringing the whole week no pick ups I called again and was given a different number same thing no pick ups. Now I'm scared to drive 2 hours only to get there and not be assisted. This is stressing me because I am running out of time cause I don't know they return policy. What if the return period ends and I'm still here stuck with the goods. I understand that It's my mistake but does their in store service need to be that pathetic that they don't answer their phones? I try morning afternoon and before 4 nothing. I just need to speak to someone before I drive for nothing. If they can't answer a simple phone call I'm even scared of going in their shop.