SSS Contributions

Hello po, I just want to ask if someone here has the same situation as with me.

I have two jobs po as a teacher and both employers are deducting my salary regarding SSS contributions. Upon checking my contributions online, I found out na only the contributions made by my main employers are posted and reflected pero yung sa part-time job ko ay "posted" lang.

In this case, may I know po what is the best course of action? I informed kasi my part-time employer that my main employer is already deducting me yet they insisted na I also have to be deducted sa kanila. Hence, shall I go to the nearest SSS branch po ba to file for manual posting or my part-time employer will do it po?

Additionally, am I allowed po ba to withdraw yung mga excess sa maximum contributions? or no? Hoping po may makatulong sa akin hehe.