Yes. The Quran warns against breaking oaths after making them firm (16:91), and warns those who sell Allah's covenant and their oaths for a small price (3:77). Swearing by Allah on a lie, in order to take money or a right, is a major sin.
Аллоҳнинг аҳдини ва ўз қасамларини арзон баҳога сотадиганлар, албатта, ана ўшаларга охиратда насиба йўқдир, қиёмат куни Аллоҳ уларга гапирмас, назар солмас ва покламас. Уларга аламли азоблар бор.
This is general information, not a fatwa. For your own situation, ask a qualified scholar.
Questions about halal and haram
Is swearing a false oath haram?
Yes. The Quran warns against breaking oaths after making them firm (16:91), and warns those who sell Allah's covenant and their oaths for a small price (3:77). Swearing by Allah on a lie, in order to take money or a right, is a major sin.