in my opinion the problem is you are using VPN, so the system detects the use of the same IP, there are several sites that provide very strict rules, even the same IP can be a big problem, You have deposited a large amount but why do you play with VPN, obviously it is very dangerous for your account, if the use of multiple accounts is very detrimental to the site of course the IP problem rules will be very strict.
VPN isn't the reason when it comes to brokers , as gr8 said many brokers actually suggest their users to use vpn so they can avoid the country restrictions
also normally when a site suspects multiaccounting the first thing they usually do is the KYC unless the site doesn't really do KYC which isn't the case with odsy , they have been kycing some people who won some money with them
also multi accounting isn't a good excuse for brokers unless there is bonus involved with these accounts , cause in theory they are offering exchanges and bookies that tolerate professional betting
I don't know how they exactly operate honestly cause there have been many cases with oribt exchange where they raise the commissions for winners , so they might have that as an excuse but still doesn't make sense when you don't do KYC or mention the accounts suspected with some kind of proofs