1)visit your ex employer and request them to with draw the absconding letter issued to you . mention that you have resigned from company on 5th january 2017 .
2) your resignation was duly accepted by the company on 15h januray 2017 and they agreed that your last working day would be 15th januray 2017
3) mention that notice period was waived by the company
4) inform your ex employer that on account of absconding letter you would lose your new job
5) if ex employer refuses to listen to reason contact a local lawyer and issue legal notice to the ex employer