Non-compliance by tenants, and forcing decisions on landlord

BACKGROUND - We have a 2 BHK, in Bangalore, which got registered in June, 2018. We let the flat to three bachelors. 1. They paid security was paid in 3 instalments and after multiple follow-ups. Last inst. on 10th July. 2. Initially, I had not provided a water heater in the flat, and they had agreed. But after moving in, they asked again, in a compulsive tone, and how everyone provides a geyser. I got it installed within two days, paying 500 cash to tenants for getting it fitted. They paid a total of 1500 as fitting charges and did not get a receipt of additional 1000 rs. 3. Incomplete items from builder's side: Latchet misalignment for one bathroom, Kitchen granite hole was pending, Builder had lost two keys of the main door, and they complained of leakage in the one bathroom. These were informed to the builder immediately after they were brought to my notice, and I am still following up with him for these. Builder has agreed to get these fixed, but the works are still pending. 4. I had asked for the rent amount to be paid in advance. But they refused. We considered it and agreed to take the rent after the month completion. 5. The rental agreement was given on 13th July, and the last date of rent payment for every month was given as 5th. Total rent amount was agreed as 17000/- and maintenance was applicable 1613/- total 18613/- PROBLEM:- 1. They paid the rent on the 7th, after more than 3 follow-ups. They would commit a time by when they would pay, but miss it each time. They paid the rent on 7th Aug, a total of 15400. They said, they had deducted for fitting and maintenance. They did not discuss this beforehand, but blamed me for the missing works by the builder, and said they would not pay for the maintenance, because I should not pay maintenance to the builder. 2. I asked them to evict in 30 days, so I can get the works completed post that, but they said I cannot do that citing clauses in rental agreement. There is no code of conduct clause that deals with the mis-behaviour with the landlord. 3. We plan to give them a warning letter citing the terms and conditions of stay, and how they cannot take decisions on our behalf. The letter states a direct violation of two clauses: rent payment date, and non-payment of maintenance, and indirect violation of code of conduct clause because of their intimidating tone used in messages with me. The clause mentions eviction in event to two written complaints. Qs: 1. Can I be held responsible for works pending by the builder, and maintenance withheld? 2. Can they take decisions on our behalf to pay maintenance to the builder or not? 3. Can their behaviour, tone in messages with me be taken as a code-of-conduct violation? 4. If they don't comply with the points in the warning letter, can that be used a ground to serve an eviction notice? 5. In case of non-compliance by them, is a copy of the warning letter required to be given to the local police station as well.