Defamed in Google reviews

Hi..I am as a vendor works with so many govt & non-govt organiser, once my company did a market show where so many other small business associate come & put their stall.. one vendor didn't come on the designated day, after that they told me to return their money (₹2006)which is not returnable but after getting so many massage & calls from them i told them to collect money from Noida or the place where we put stalls. They told me that they want their money by online platform which i refuse. The massage which I wrote them was " if you need your money then you have to come to Noida, when ever you are free ..No worries..call me when you're coming or anyone from your side..pls take a prior appointment so that I'll be available". On the very next day i go the the venue & return their money as instructed by them... As I also purchased their product in cash a long time ago so I share my opinion & review their product & service on Google reviews. Business associate of that company called me at 12:45 night but didn't pick coz I was sleeping, after that In my review the company wrote a massage that that you (me) were asking me (women entrepreneur) to meet personally at odd location and when I (she) didn't entertain your (my) demand you threatened to ruin our Google reviews & create scene at our work place. After that my organizar with whom I worked that event told me to delete the review so I did that on their request. After that they again started that & even they claimed that they blocked me with that organiser. They claimed that that was done by them. They told me that they'll file a case against me What should I do? File a case against them as I"ll loose a good amount of if I am blocked by my organizar.