Today, the employable age makes it advantageous for freshers because all companies advertise looking for them. Now, if you accepted an offer and have not even completed one month before jumping to another, my first point is to be true to yourself. Consider that the payment of one month is your investment and just move ahead by either paying the amount or allowing a deduction from your pay, and be grateful to your employer.
Down the line in your career, who knows, the same executive may interview you in another company or reject you as unreliable just by looking at your photo in the CV. Don't think you can get away with this by arguing, as destiny might lead you to a similar situation. The world is small, and your face is your index to your professional world. The rest is left to you to decide wisely or face the consequences.
After writing the reply, I observe that he is agitated with his responsibilities. He has not edited his question with full details but is starting an argument. Initially, I thought he was in IT. But when he mentions B2B & B2C, it seems he doesn't want to learn but expects a white-collar job in B2B, sitting in one place.
Opportunities do not strike frequently. I see many product executives in marketing who visit distributors and customers to know the end-user details and conduct research for the company to improve the product and innovate. Without customers, there is no business, and this applies even to a shop.