Two years is a lot of lost time fighting over $1000.

The $1000 is only worth fighting over if the lost time involved could potentially less than $1000.

Most credit card terms of service only allow for a short window to file + resolve disputes... sometimes 6 months... usually 3 months... so it's unlikely you can get this handled through normal channels.

Alternative: If the $1000 is really worth continued time spend, then draft a letter to Barclay's CEO + all board members stating the problem + the exact resolution you'd like, which in your case will likely be a $1000 card balance credit.

Tip: In the future, use PayPal, where you can more easily dispute charges.