Sharp Practice pick n pay

I took a sodastream empty cylinder for a refund of my deposit. They refused to refund it claiming their system couldn't deal with that. I have been buying full cylinders from them for years. I have also previously been paid R50 deposit for an empty smaller cylinder. I contacted sodastream who say refundable at nearest store on website but am still waiting after weeks tp hear from them. So don't be fooled into paying a deposit that you will never get back. It is just sharp practice and a money making business. I even contacted the owner of the outlet Village Market. Westville and have never heard another word.