My previous company delayed my relieving process by 10 days. Despite of my successfully serving the Notice period of 1 month, my previous company HR and managers forcibly asked me to serve for 10 more days in their company and didnt hand me over my relieving and experience letter. Becoz of which I got delayed in joining my new company by 10 days. Though I have constantly kept my new company informed about the entire thing, still can my new company reject my joining becoz of this issue? Or does my new company have the authority to further negotiate with me on my salary just becoz I couldnt join their company on the date we agreed upon when they extended their offer letter to me.