For context, I recently upgraded from Fiber Unli 899 to Fiber Unli All 1399. The main reasons to upgrade were the speed, Famcall with landline, and Cignal Box. Fast-forward to my first billing on February 15, 2025. I was shocked with the bill, which amounted to the photo shown below.

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I was charged with the pro-rated bill for my first month (which is normal)
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Then, I was charged with a Service Fee for February and March (I guess this is also normal. When I applied last year for PLDT, an advance of 1 month's service fee was required)
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Lastly, I was charged for the one-time fee of installation and modem activation, which sums up to my remaining modem fees from 899 for 100 pesos monthly in a 3-year contract.
This is where the problem comes with PLDT Billing's Team. I already reported it the same day I got my SOA to only get disapproved of my billing adjustment request, then proceed to re-ticket my concern without telling me why it got disapproved when all of the agents I talked to at 171 hotline are already vouching that there should be no one-time fee for modem installation and activation. They also stated that Fiber Unli All 1399 has free installation and Activation, so my remaining balance with the modem should be waived.

I'm getting frustrated with their process and approvals when it comes to billing and technical services. Should I report this to NTC? If so, how do you do this, as this is my first plan in my name.