Free Breach of Contract Legal Advice

I entered into a collaboration agreement with a builder in 2016 for construction of 4 flats on my property out of which 2 were mine and 2 his. The agreement was renewed in 2017 and when work was still not completed, i filed a complaint with delhi mediation center in december 2018 deadline of which he agreed was april 2019. till now work is not yet completed and I want to send him a legal notice giving him a final deadline failing which he has to forgo his 2 flats which I will sell and use the money to complete my flats and claim as compensation. i am unemployed and in a very bad financial situation because of this delay.

Offence under section 491, IPC , since the insurance company, despite being contracted to cover hospital bills, has refused to pay – meaning breach of the service contract – by invoking an exclusion clause under a head which is dissimilar to the head describing the nature of the medical procedure performed on the person insured.

Dear Sir / Ma’am, Greetings from Company Vakil !! In

Allegation on me for Parallel business ,
Solicitation

sir / madam
(The case is discussed changing names and places for keeping identity private )
(the commodity is GST EXEMPTED)
The case is : ( RAM from UP- he is a trader of commodity ) sells goods to ankur (KARNATAKA – also a trader of commodity) . Ram billed the goods in the firm name of ankur ( let say A dealers ) .
Now ankur has some another firm ( let say B dealers. ) Ankur sold the goods to karan (a party in karnataka having a private ltd. company with karan enterprises pvt. ltd. )
ankur billed it from B dealers (with gst no.and weight slip) to karan enterprises pvt. ltd. and received full RTGS from karan enterprises pvt. ltd.. Now the problem is RAM doesnt got money for the goods as ankur is termed as a Defaulter .
ques. are:1) what liability does mehta enterprises have now ?
2) is this case of 420 ?
3) can UP police come anyway and arrest karan in karnataka ?
Thank you .
Opinions would be appreciated.