Management & staff gave me bad attitude

I went there to purchase a kiddies laptop for my daughter...paid for it & was stopped by the security guard who asked me why my till slip doesn't state that I purchased the product but instead states that I came collect it (CCD). The issue had to be raised with the manager who instead of coming to me, summoned me to him but didn't assist me. I was left there standing alone with no assistance for 30mins... After that,another staff member came to me with a voucher which I refused to accept because at that point I just wanted my money back. I was toldto go back to the till but when I asked if I need to stand in the line again, the lady said she doesn't know (with an attattitude), I then asked to see the manager again but I was told to go look for the manager myself & she walked away...... The disappointment in my daughter was the saddest part of the whole experience because she had chosen the laptop herself