...He told me that was not his problem, which is when I swore them off and posted my message.
Typical customer services scenario, just take a deep breath and stay calm, always keep thing in perspective, the guy on the phone is just a regular guy doing a thankless job for not much reward, and if you do not get the required response ask to talk to the customer services manager, if that fails take advice from a free service.
Remember to take ownership of the problem as you want something from them, If you swear, blame or bad mouth customer service representatives, it will not resolve anything and will make them less likely to help you out!
What I mean about taking ownership:
It is your mistake and you want it resolved, so you need to take perspective and be assertive but not agressive, if you cannot resolve it by talking to the customer services guy or his line manager then thank them for thier time, and take advice and another approach, use the when and I words, "When I purchased the product, I did not realise it would not suit my requirements, I understand that you have policies on returning goods, I am willing to pay any restocking charges and I would really like your help in this matter', I have found that being polite often works and the seller will often bend the rules slightly to help out.
David

If someone has had your drill they borrowed for a couple months rather than saying, "you borrowed my drill and I want you to bring it back", try "when I lent you my drill, I did not think that you would need it for to long, I have a job to do myself today and would like to pop round and collect it"