Sorry - have not heard much about RD System
Autocop is a much prominent brand name with a name for there Service Network
I believe - they even send a person to your place if its under warranty and same is applicable pan india - across over there 100+ branch offices .
There has to be a reason why Autocop commands a major share in Security System - some other brands are Minda, Nippon - which too are well known.
About RD System - Central Lock - as we have not heard much about it - so will not be much to comment about. However - you may try speaking to there customer care numbers as given on there website
and check on the response from customer care center - how well they attend if part is under warranty or so.