selling whatsapp API on very lucrative price

i registered on a facebook ad for WhatsApp api purchase. hey called me and upte me 10000 msgs for rupees 5000. Later they agreed upon providing me 1000 msgs for rs. 1000 and I paid the same they told me that they have to register my MSME Online and proceed further. they have shared me account number on the same campany name what I registered for enquiry on Facebook. is it scam of legitimate business. I have to wait for further response or I have to report it to my bank.