This is my response to you:
1. Without proper written intimation they cannot recover the money from you;
2. Only after sending you intimation and if you fail to reply within a specific time period then only they can take your money in the manner they have done now;
3. If you had asked for some time then, they have no right to recover so abruptly;
4. You must send a legal notice to them;
5. If they still don't respond then you should file a suit for recovery.