Who called from 7788618996

I recieved a letter from a Steve Brown @ 1-778-861-8996 claims Agent.
recieved a check for 49997.00 said I won 250,000
Tax agent I suppose to send this to
Latoya Leban
276 revenue square
St. John NB Canada

Where do I report these people??

I recieved a letter and a check in the amount of $4997.00 to me Robert D Stenson, 14100 88th pl n.e. Bothell, Wash. 98011
The letter said to contact Steve Brown, tel. 1-778861-8996, I tried to call this number and I got a recording saying that " your call cant be completed as dialed, please the number and dial it again."
There is also a Tax Agent: Latoya King, 276 Revenue Square, St.John NB CANADA  Tax Amount of $4600.00
What do I do???

Sincerely,

Robert D Stenson
<[email protected]>

Received a letter from Sun Life Financial with a check from Care Improvement Plus for $4,997.00.  Letter indicated that the check was to cover Government Service Tax for non Canadian residents.  Tax Agent:  Latoya King, 276 Revenue Square, St. John NB Canada.  I called Care Improvement Plus to let them know we received the check drawn on their account.  Who exactly can we report these people to?