Selling of land.

Our neighbor wanted to acquire your land, but upon making a contract, it was discovered that there was no mutation for the property, which is 24 years old. An agreement was made that 90% of the amount would be paid to you by the end of January, and the remaining amount would be paid at the time of registry, so that you could use 90% of the funds to buy a house, as it was taking time to make the mutation. the buyer of the land has given 50%their portion, and you've forwarded 50% of the amount for the house. Now, the buyer is refusing to give the remaining 40% because, according to them, mutation cannot be processed. And now you've also refused the owner of the house. We have applied for the mutation from our side past time the other party applied for the mutation. Not the situation is Now, as we are putting up fences on our land, they are threatening to break the lock. They're demanding that we return the amount we received, otherwise they'll file a police complaint. We'll only return the amount when the house owner refunds us. We're very distressed, please suggest something