Harrassment from Rochester

I bought a couch set from Rochester on finance 3 weeks ago. I am now receiving 8 calls a day from *** claiming they are from Rochester and they want to do a courtesy call but then they want me to disclose my personal information over the phone, such as my ID number and then when I tell them I am not comfortable to disclose my personal information over the phone then they drop the phone in my ear. I have phoned their customer care and they say that number does not belong to Rochester but they know about the couch I bought from Rochester 3 weeks ago and all my details.

They have even started harrassing my employer with the number I gave to Rochester to confirm my employment.

I receive on average 8 calls from them a day and I am at the point of opening a case of harrassment against Rochester. If this is not Rochester then Rochester has disclosed or leaked my personal information to another party as they even have my employer details and know every detail of the couch I bought from Rochester.