Waiting refund from July 2015 on grey product sold

I bought a Nutribullet from Groupon in March this year. In July we were contacted by Groupon stating that they had been informed the product was potentially inferior and should we like a refund they would arrange the refund. Upon further investigation with Nutribullet SA it was apparent that the product was in fact a grey product. I then requested the refund from Groupon but to date despite numerous phone calls to the call centre I have not been credited the amount to credit card ...this goes back to the 31/07/2015! Not one Groupon consultant has followed up to see if the refund has been processed. I the \customer"have to continually contact groupon each time wasting my time approx 20 mins on each call. I have even contacted my bank to find out the process which involves Groupon contacting card division to have the refund allocated which I have informed Groupon to no avail.<br> <br> I am unimpressed with the lack of service to the point I will never purchase from Groupon again.<br> <br> When will I receive my refund?<br> <br> Valerie Message"""