Lost my receipt

I am so flabbergasted my the owners attitude towards the customers at Faraday,I went there on Saturday this past weekend with my ID,thought i had my deposit slip with only to findout it wwasn't in my bag,<br> The owner than said that if I haveno physical document he ccan't help as I wanted to change the product I deposited, I have a bank statement that proves that an amot of R400 went out of my account for laybye,I know they also havea copy of the deposit slip.I dont know what to do but I can't just loose this money. I worked hard for it.I am just so torn about the service I got,how come when they take the money its so easy when they have to service they become so mean and unhelpful. I doubt I will ever buy here again. I use to be a customer. I am in disgust.