Went to get my tickets at the Yu gardens. Took an hour to find a lady who told me to go to people’s square to redeem. Went there. The people at booth said there was no record of my booking and refused to help despite me having emails and codes to show them from Viator. Rung customer services who rung them and they did not answer. Asked customer services to organise a refund. Since then customer services has emailed to say I redeemed and used the voucher so no refund. I will be contacting my bank but still what a lot of hassle. I won’t be using Viator again.