Is it credible for the post office to pick up the package by SMS?

Absolutely unbelievable. According to the regulations of the postal department, the parcel was not notified by SMS.

According to the information you provided, it must be a scam. Be careful. The simple way to see through this scam is to find out where the telephone number 0775-2595265 is and which department it belongs to. Or check whether your local post office uses the telephone number 0775-2595265. Deception! Watch out!