last original invoice and payment receipt is the most important thing in this case. without the receipt, everything is gone.

And also when you terminate the account, they will give you a copy of the termination later, stamped by the termination branch and signed by the officer in charge, do you still have that?

I'm afraid nobody will know why you are charged with 1.7k unless they are from TM themselves. Call up TM and ask them for the relevant dept/contact person where you can check this, if those VADS guy doesn't know what to do, you can just step into menara rebung there and storm the tmpoint there, surely it can be resolved rather quickly and clear up all misunderstanding.

I have terminated my streamyx in early March, but now they are still charging me with the usage for April and May. I have sent a number of emails to help@tm.com.my and they said the issue is still under investigation.

This week I will try to resolve this once and for all.
Shall share with you if I can find out anything.

Got email from TM mentioning that my account has been terminated properly now. They have also waived all outstanding from my account. Hmm. Pretty efficient I must say.