<span>Julio: No, hombre. Pero hay muchas computadoras en la biblioteca. Tienen la red y todo. Yo mandé un e-mail a muchos amigos y recibí el de Iris Teresa. Es muy fácil.
Pablo: Entonces, voy a la biblioteca esta tarde. Quiero ver si tengo mensajes. Tal vez también tengo un e-mail de Iris Teresa. Posiblemente me dijo algo de José Antonio.
Julio: Llamo del hotel
Julio: Para mí, no cuesta mucho. Tengo la tarjeta de crédito de mi padre.
<span><em>This is a conversation between two friends Julio and Pablo. Julio went to the library and was amazed that there were so many computers. He sent an email to several friends including Iris Teresa who is a friend of both. So Pablo wanted to go to the library as well to find out if he had a message from Iris Teresa and José Antonio. Finally, Julio calls from the hotel and he had his father's credit card. Apparently he would pay using that credit card, so he stated that that called was not going to cost much money.</em>
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Creo que solo tienes que ver si está bien
The verb that is in the incorrect past tense form is decia because when it says it in the sentence, it would be mé dijo instead.
The answer is decía. Hope this helps! :)