Vodafone — messages from unknown person

Good afternoon sir/madam im satish a student doing my mba. yesterday night i had a fight with my friend and we were just carrying on the fight through sms suddenly i got an sms from this number [protected], the message consisted the matter which is related to the matter upon which me and my friend were talking but neither o[censored]s know him. i have called him and asked the same he told me that his name is ravi and he is doing his b tech dont know whether it is correct or not. he also replied me from a different number [protected] pls look into this matter and provide me a solution as it was completely personal matter between me and my friend and dont know how that person came to know abt this. i request yout to provide me the solution to this as soon as possible.