birthday voucher

My birth day was on the 18th July and I belong to the vip club so we get a birth day voucher as specified in the package of being a vip club member. At end of July I received my club book but no voucher so I went to the green acres customer care center to find out why not and was told they now sms it and do not post it any more. So they logged the call and I was told it was because they still have my old number (which I specifically went in to store to change about 4 months ago) but I again gave them my number and was told they will send the voucher within 48 hours. I waited 2 weeks and still did not receive it so went back to store and they called again and check my number which was correct. I was then told everything on there side is right and it's up to marketing to send me the voucher because they already logged the call. I asked how long still as its already been 2 weeks and was told they don't know and there is nothing further they can do as they have already logged the call with marketing. So now I'm confused because I do not know how long I still have to wait or what to do next.