Whatsapp issue

Just been “Migrated” To T-mobile after 20 years with Spring. First day, recieved a text saying charge of $81 no reason why. I called customer service, they said its for a 27 minute international call at $3 a minute. I said I call overseas many times a day but use Whatsapp and have never been charged by Sprint. Also  I have a land line where international calls on Onesuite.com are only 2 cents a minute!

Looks like I’ll now be “migrating” from T-Mobile.