请问:我在单位上班有三年了,我们单位的社会保险是去年下半年才一次性交清办好的。职工个人缴纳基本工资的27%,其余部分由单位缴。最近,我想跳槽,单位领导告知我如果要离开,就必须把三年来社会保险费中单位所交的部分全部退还单位,理由是因为是个人的原因要辞职,单位不会负担之前的社保。请问,单位的这个说法和要求有无法律依据?我该如何保护自己的权益呢? I ask: I work in the unit for three years, and our unit of social insurance is a one-off payment in the second half of last year to do a good job. Individual workers pay 27% of basic salary, the rest paid by the unit. Recently, I wanted to quit. The head of the unit told me that if I wanted to leave, I would have to return all the part of the social insurance premiums paid by the unit within three years for the sake of personal resignation and the unit will not pay for the previous social security. Excuse me, there is no legal basis for this unit's claims and requirements? How can I protect my rights?