Review Poor experience in purchasing items

I purchased items online, get invoice, made payment via PayPal.
But the company replied that there was no stock and asked me to purchase with a higher price instead.
I refused and asked for refund.
Although it was refunded but there was service charge by PayPal.
My point is if no stock, please state clearly in the online platform.
Now I suffered from the service charge, and I will not consider to purchase any items in this company.