They will do it, so long you will reply, because in this way they maintain the contact. Stop the contact mean really STOP IT: dont say anything, dont answer at phone when they call you. Dont read emails, if they send you emails. Just change your email adress, if is possible, change your phone number - if you want to be sure that you will not receive any oher calls from them.
Help yourself by helping others - report your scammer here.Google can be your best friend
;use it if you have doubts about someone met online. If someone met online only asks for money, no matter what reason, it´s 100% scam.