Dont seem able to rectify a simple account problem

I purchased a course via Groupon. But unfortunately made a mistake with the reference number given, transposing one digit.<br> <br> I emailed their accounts department with the proof of payment. Telling them of the error I had made. <br> <br> I was told by one of the accounts people \I will request for our payments team to check the payment and allocate credit to you Groupon account so that you can repurchase the deal"<br> <br> That was over seven days ago. The deal will expire soon and I'm still no closer to having this sorted out.<br> <br> I'm disappointed by the lack of service received. """