Nobroker — Forcefully sending Newsletters regarding property listings, Upgradation for premium plans, and promotional advertisements.

I have unsubscribed from no brokers, but they re forcing me to check property listings from their site along with upgrading to their membership plans. they are forcing me to take their membership plans. i told them no. still they are spamming my inbox with mails after mails. the are harassing me. they are being stubborn in not unsubscribing me from their mailing list, and in spite of repeatedly telling them to deactivate my account permanently from their databases, they are neglecting my request from customer care itself. they are saying ok sir, ill do it. but still i'm getting, advertisements, updates regarding subscription upgradation, newsletters, and search recommendations forcefully.
please look into the matter as soon as possible, and help me out. please take necessary actions regarding the same.
the app, and its services were of no help or use to me. as a customer, i was not satisfied with their services. still they are pestering me to apply to nobroker.com.