Hey there
in many universities there are programs which offers masters+PHD in this way you can easily do PHD even though you have no masters degree right now. most of such degrees are offered by foreign universities like MIT, harvard, caltech, yale etc. In india IISC, IITs and many others provide such courses.
check the link
https://studyabroad.careers360.com/articles/how-apply-for-phd-after-bachelors
good luck
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