Hi there @kchungneng !
Wow. Bad things happening to you so many times in a short period of time... I can totally understand your frustration. But I think you better contact them via their FB messenger or call them (I prefer thru their FB cuz I can keep records of what they say). If they still can't solve your issue or give reasons that is not acceptable, you can take the case to another level and go to MCMC. Usually they'll do a more thorough investigation.
Cuz referring to Celcom's track record on this Community forum they will highly likely to ask you to contact their Customer Service as well. :/
Hope I could help a bit. Good luck to you!