The training you have mentioned does not seem to be any such training that shall grant some extra ordinary or exceptional skills to employee or some additional qualification.
The training that is provided by the company to perform routine work of the company should be provided without any cost to employee.
Tomorrow if companies claim employee was taught how to tie the knot of the tie, or how to walk with high heels would that amount to training…………..
Further you have posted that no such training was provided.
Instead of 8 weeks the employer kept you in training mode for 7 days i.e. 1 week.
So if at all there is some liability it should be pro rated by 1/8th.
Even this training was provided by some professionals from some institution or some manager on payroll of the company.
Employee should also and always consult before signing on dotted line.
An ill informed, fresher, in experienced or fearsome employee is like sitting duck and is most likely to be exploited by unscrupulous employers and their HR and line managers.
Smart employees build favorable written record before separating.
e.g.:
https://www.lawyersclubindia.com/forum/Company-introducing-new-exit-policy-during-notice-period-80765.asp#.UZpNSaKAqWM
You may show the job advertisement, interview call letter, selection letter, offer letter, appointment letter, bond, to a competent and experienced labor consultant/service lawyer specializing in such matters, and let him draft and structure some
Representations/ communications so as to build some written record in your favor before you resign.
In the meantime you may go thru attachments.