Poor customer support experience

We complained about the lack of 30 ml refills for our sodastream and was offered an upgrade to a 60 ml provide we sent our old machine to sodastream. We followed their instruction and paid for the upgrade. Proof of payment provided to Dawn Pearce on 13 and again on 18 Sept. She reads the messages but does not respond. The call centre number does not get answered. We had 5 30ml gas bottles as availability was poor. it cost us close to R1k and we got R10 per bottle when we returned. Extra 60 ml gas bottles cost close to R500 including gas, No name brand 2 l soda water from retailers may be a less frustrating and better option. Lets hope they repond to this review on Hellopeter. Customer support not one of their strengths.