Hello @tiziana_d_g if a buyer comes with that type of things like telegram or say you to do work outside of fiverr platform simple report there msgs as spam and blocked them they are useless. Don't ever try to work with that type of buyer's they are in search of to hire someone and then disappeared after getting there work.
Be aware from that type of buyer's. Good and trusted buyer's will reach you soon just focus on your account.
Best of luck 😇