When someone says that he did not have time to call you, it does not mean that he did not really have time. It just means that you do not have a priority. If a person actually wants to call you, then he will sacrifice a conversation with another person, watching TV, digging in social networks, lunch, dinner, sleep, after all, but he will definitely call.
So there is no such thing as “there was no time to call.”
Simply, there was not enough desire.