Do you wish to mention that this letter was never received at your end?
If this letter was not supplied to you should state so in writing and demand POD and emphasize all communications be sent by redg . post. Company shall communicate at your last known address in records. You can change your address to............any address suitable to you including c/o your lawyer, if your lawyer agrees.
"You may also note that you will not be relieved from the services of the Company unless you deposit the amount as per rules."
Have you been supplied these rules? You may point out that such rules which justify amounts to be paid even if there is no training have not been supplied to you.
Kindly consult your lawyer and let your lawyer structure and draft your representations.