Hi, I have been doing some work for a client for a few months. Payment was done in advance by paypal every time. Lately, I was supposed to deliver some work of which 50% payment has already been made. Unfortunately, there was a delay from my end due to reasons beyond my control and I sent an email to the client informing him of the delay and telling him that he can either get a refund of the advance payment or I can do some alternative work for him in the meantime. He replied saying that i'm scamming him. First of all I don't understand how is offering a refund scamming? Secondly, I'm getting a strong feeling that when I refund him he is going to file a dispute for the previous work I have already done for him. How should I proceed? Thanks.