Studying Tawheed and making our hearts firm with it is the key to success in this life and the next. It is ONLY with Tawheed that your difficulties are removed and happiness is attained. Know your Lord by studying about His beautiful names and lofty attributes.
These above narrations is a rebuke to those who (falsely)believe & promote the belief of calling upon the dead in times of difficulties. The Prophet صلى الله عليه وسلم clearly showed us to call upon Allaah only, he didn't say "call upon me",he instructed us to call upon Allaah!