Videocon — machine tripping

Address:

C/3/1, Trimurti Apartments, 590 Rasta Peth, Pune, Maharashtra, 411011

Model v. Na.811 top loading washing machine is tripping after some time in all modes of washing. Also many times chattering sound in switch while switching on the switch. Got it checked by electrician. Its on off switch is faulty and needs to be changed. Where can i buy this switch. I do not want to buy new machine as this washing machine is still in very good condition even after more than 20 years o[censored]se. We are happy with using the machine. Kindly help with procurement of this on - off switch.