Bag broke within a week

I received a sling bag from my mom last week Thursday on my birthday and I had it on twice and the clip on the one side of the bag broke and I asked my mom for a slip and she does not have it as she bought it 3 weeks ago and disposed of the slip already and I called the store today and spoke to Simone, explained the situation and she was basically telling me that she cannot help me at all and i asked can i speak to the store manager and she told me that the store manager is on leave and she is the manager for the time being and i asked when the manager will return and she could not tell me. I explained that it was a gift and I do not have the barcode or anything, I just want to exchange it for a different sling bag and not get a refund and still she told me that she cannot assist me and the policies has changed. i would like to exchange my sling bag as i am unable to use it and I would like the area manager to sort this out and get in contact with me ASAP to make sure that it could it could be done as the store was very unhelpful!