If you are having any complaint, advise etc related to MCD and feeling trouble in contacting them then here are some phone numbers. You cam lodge your complaint and can have your complaint no. as well:
Control Room HQ 011-1266/23220010/23220016
City Zone 23261527/23261528/23280885
Civil Line Zone 23942700/23923392/23923394
Karol Bagh Zone 25812700/25754339/25754341
Sadar Pahadganj Zone 23512700/23682091/23617022
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West Zone 25422700/25191014/25191016
Central Zone 29812700/29810705
South Zone 26522700/26517191/26517188
Shahdara South Zone 22303700/22300175/22300171
Shahdara North Zone 22822700/22821484/22820431
Najafgrah Zone 25321235/25321235/25322818
Narela Zone 27783783/27783785/27783261
Rohini Zone 27042700/27050132/27050133