I know of a very similar case (but with an insurance product sold by a Bangkok Bank branch'es manager), the deduction (direct debit) was stopped and the premium (some 100K) was forfeited (by ?) though there is a clause for 'benefits return' in the insurance policy and promotional materials. Further legal action is not taken though 'unfair' practice is strongly perceived but legal cost can run into very large amount.
A lesson to learn with a lot of water to wash it down. Never let greed (lobha) take our hand and lead us to do what other greedy bodies want to do.