As the person is petulant, he/she does not want the help or opinion of others, so the customer is not agreeable to the help that others offered.
Explanation:
A petulant person is someone that does not take into account the suggestions that others may make to help and considers himself or herself as someone with great qualities. The person acts childishly and has a little temper. The word agreeable relates to petulant because it is something that a person with this characteristic lacks since he or she does not take into consideration what others say
