"Shall not" is contracted in to "Shan't," and not to "Shalln't."
Not criticizing, just informing: the word youre looking for is, in English, "Shan't."
Also, in English you avoid and forgo saying a contraction when emphasizing something; if it's somebody being forceful with their words, they dont use contractions, but instead pause between the words, giving emphasis to the last word. Will not; do not, shall not; so the caravan leader, who would say "Shan't" in casual conversation, would likely say "shall not" on page 11.