Woolworths Vouchers misrepresented

I am signed up for WRewards with Woolworths I recently received a Woolies Beauty voucher - Save R200 when you spend R1000 or more. I went online and selected the products that I wanted and tried several times to use the voucher and it wasn't accepted. I eventually called Customer Services where I was told that the voucher could only be used in store - tho it does not state so on the voucher. The Service Consultant told me that the only way that I would know is by calling (this too not stated on the voucher). The products that I wanted to purchase is not available in store - only online. I feel that Woolworths misrepresents these vouchers to trick customers in spending more money as the voucher can not be used online. This is tantamount to *****. I am not impressed. I have been a Customer for over 40 years and this is the first time this has happened. I have another voucher (because I spend money at Woolworths)and the Service Consultant told me that that voucher too can only be used in store.