I doubted that one of the pebbles

Q: My wife and I performed the obligatory Hajj this year and I discovered some mistakes that were made when throwing the pebbles at the Jamarat (stone pillars at which pebbles are thrown during Hajj) after leaving Al-Muzdalifah. We both threw seven pebbles, but we found out when we returned that we had thrown them at the back of the Jamarat, i.e. Over the pillar from the back. We discovered this on the second day, i.e. The 11th of Dhul-Hijjah, after throwing the twenty-one pebbles at Al-Jamarat-ul-Kubra (the closest stone pillar to Makkah), Al-Jamarat-ul-Wusta (the middle stone pillar) and Al-Jamarat-ul-Sughra (the closest stone pillar to Mina). I asked for a Fatwa (legal opinion issued by a qualified Muslim scholar) on the second day in Makkah, from some of the Imams, and they told me that I should observe Sawm (Fasting) for three days, because I did not have time to return to Mina to throw the pebbles again as I was about to travel. Is it correct for me to do so or not? I hope you will advise me, so I can be reassured. Also, I remember that I threw the pebbles on the 11th and 12th of Dhul-Hijjah, starting with Al-Jamarat-ul-Kubra, then Al-Jamarat-ul-Wusta, and then Al-Jamarat-ul-Sughra. Was that correct? If this was wrong, what should I do? After performing Tawaf-ul-Wada‘ (circumambulation around the Ka‘bah on leaving Makkah), I stayed in Makkah for about two to three hours to offer Jumu‘ah (Friday) Prayer. Was that correct or not? I hope you will answer me and I thank you in anticipation.

(Part No. 11; Page No. 276) A: Throwing pebbles at Jamarat-ul-‘Aqabah (the closest stone pillar to Makkah), in the way you described is not correct. It is obligatory to follow the prescribed order when throwing the pebbles on the 11th of Dhul-Hijjah, and afterwards. You should begin with Al-Jamarat-ul-Sughra, then Al-Jamarat-ul-Wusta, and then Al-Jamarat-ul-Kubra. If you differ from this, it is obligatory on you to throw the pebbles again. If you do not do so at the time for throwing pebbles, during the days of Mina, it is obligatory on you to sacrifice an animal that serves as an Ud-hiyah (sacrificial animal offered by non-pilgrims) in Makkah and distribute the meat to the poor people there. Staying for two or three hours after performing Tawaf-ul-Wada‘ is permissible.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.