CASE:

Mr. A leased his house with a telephone to Mr. B. The lease contract provided that Mr. B shall pay for all electricity, water and telephone services in the leased premises during the period of the lease. Six months later. Mr. B surreptitiously vacated the premises. He left behind unpaid telephone bills for overseas telephone calls amounting to over P20,000.00. Mr. A refused to pay the said bills on the ground that Mr. B had already substituted him as the customer of the telephone company. The latter maintained that Mr. A remained as his customer as far as their service contract was concerned, notwithstanding the lease contract between Mr. A and Mr. B. Who is correct, Mr. A or the telephone company? Explain with legal basis and maximum of five sentences only.

Ps. I'm a Filipino student and I need help with my assignment regarding my OBLIGATION and CONTRACTS assignment. If you need a referenece of the topic, here's a pdf file of our book (Starting from page 441 entitled contracts).

https://drive.google.com/file/d/1D9GZ3CB8S1TgTQMJAVOcJ4eJkNTHKH-4/view?usp=sharing

I prefer Filipino tutors as much as possible since they already tackled this subject during their college days. Thank you tutors, and God Bless.