I e-mailed the company inquiring whether the cartridges were chipped, and they replied "Yes, they are chipped". However, when I received the cartridges a few days later they were un chipped, and therefore unusable to me. I emailed to the company explaining what had happened, and they were very understanding, and quick to answer my question, and say they will refund my money.
To return the cartridges to them, (so to receive my refund), I have requested a pre-paid return slip, as I feel I shouldn't be further inconvenienced because of their mistake. However, they insist I pay the postage costs of returning the cartridges, and they will reimburse me afterwards.
My question is, am I legally bound to return the cartridges at my own expense?