I worked with a company (A) for almost a year. While hunting for a job in my favorite field , I applied to another position (more responsibility, tasks and higher level job) in same company (A) and got the job after they denied me the first time.
While in the process of networking and sending emails to hiring managers that I am good candidate, I also applied to company B.
I did not receive any offer letters from current company(A). Company A considers it a inner transfer despite the job being in a different department with more responsibility, tasks and higher level job and should have a pay raise. While in the process of transfering and waiting and waiting with my current company and setting up a transfer date...I got a job offer from company (B). I accepted the job offer from company B because of the higher salary and it is near my house. I am currently waiting to set up my start date. Since it was the beginning of the hiring process in company B and not knowing my start date there, I started my job in the current company (company A) in a different department...without signing or accepting a job offer. The process of company B is in background check and trying to figure out the start date and can take another two weeks
How should I cope with this situation in the best way possible?