Harassment by service provider spamming and calling me by diff numbers

hello, i was availing services from tikona, on 19th june i sent them a request for disconnection of my services and collect thier device from my premises. from that day they have made my life hell by spamming and calling me from different numbers and each and every one is forcefully and enforcing new tactics to harrass me , they say you can transfer the connection to your friend ,relative ,neighbour you can take the connection wherever you go ,you can take pre paid and many more offers n which i have already given a straight no and simple disconnection but every day they call from different numbers and start the same story and are not disconnecting my services neither are they collecting thier device thier customer care tells me on phone that they will not collect device,to my same request on thier forum they said they will collect is post disconnection,following dual practice,overlooking telegraphy act 1933 to raise false bills and claims against me kindly help sir