Terrible service

I only shop at pick n pay verulam however after the bad service I received I will not be shopping there anymore. I bought 1 lux soap with the rest of the stuff that I bought however the cashier cashed for 2 lux soap. I only looked at my receipt when I went home. I went back to do my shopping a week later and showed the receipt to the supervisor of the store and she advised she is unable to refund me nor can she give me a soap for the price as I came a week later to claim and their camera footage does not store footage for a week. This is totally unacceptable as I was ****** by Pick n Pay. What happen to good customer service and that the customer is always right.