No customer service?

I ordered a book on the online store on the 9th of January and recieved it that same week. I recieved the wrong version of a book I had been looking for so I contacted customer support a week later once I had realised. I contacted the customer care numbers and had no answer on all the numbers, so I emailed them. I still have not recieved a reply after sending two follow up emails in regards to returning the book. They say in their return policy that we have to make them aware we would like to return, but don't answer when a request to return is asked for? I am very disappointed in the customer service and I am annoyed with the lack of care if they just don't answer anything. I will not be purchasing through exclusive books again, due to the terrible experience.