No response from call centre or e-mail

I made a flight reservation via [URL Removed] I subsequently received an e-mail notification that the my flight had been cancelled, that I had been moved to a later flight on the same day and that I should contact the Tripsta call centre to confirm whether I was happy with the change. I eventually got through to the call centre telephonically, confirmed the new flight details and accepted the latter flight. I sent an e-mail agreeing to the new flight as well and requested an updated electronic ticket.<br> <br> It has been several weeks, and I have not yet received the revised electronic ticket. I have spent 20 minutes on the call centre line without a response before giving up. The call centre has also dropped on me while waiting. I have received no response from the customer service centre [Email Removed] The underlying airline is unable to assist me as I did not book the ticket directly through them. Please help!