Disappointed in service

I ordered a product through Groupon on the 6 August 2015. I gave my work address and name of the company I work for as my preferred choice for delivery address. I have made many orders and had them delivered to my place of work with no problem. I phoned Groupon today to find out where my order is as it is now September and I have not received my order. I had also sent emails asking about this last week. I have now been informed that my product is being returned to sender as there was a problem with the address, I can no longer receive my product and will be refunded. No one contacted me to tell me there was a problem and I am sure if I hadn't phoned today I wouldn't know about it either. This is very poor service and I am incredibly disappointed and at this point will buy anything from Groupon again.