Dear Abhi, You have posted another message at
https://www.citehr.com/345552-job-ho...-3-months.html where you state that you moved to a smaller firm for double the wages and a change in position. Now, do you want your old job back at lower pay? If not, why should the company pay you double the wage and a promotion after only 3 months, that too at your request? I learned long ago that "Beggars are no choosers"; that's what you would be if you approach your previous employer.
The situation would be entirely different if you had worked for a longer time in the new company and you were "headhunted" for a job in the old firm. These things happen in this age of technology.
Have a nice day.
Regards, Simhan Learning and Teaching Fellow (Retd.) The University of Bolton, UK.
"It is never too late to learn or improve oneself."