I believe you have put yourself into this position. 

You should have shown some professional behaviour and resigned from your job in Oman if you did not intend to continue on the job.  My going on a holiday and not returning back is an irresponsible act on your end, and you need to realise this.

You may know some trade secrets from your Omani employer, which if shared to third party could cause loss or damage to them.  If this is the case, they are right to pursue you for confidentiality breach.

However, if you genuinely need a solution to this, you need to apologize to your ex-employer in Oman, and submit a declaration that you wouldn't use their inforation in anyway harmful to them.  This way, they could consider dropping the case.

Good luck!