Not one from Globe would want to answer this but IT USED TO BE that getting bill rebates, a subscriber could opt out anytime he wants and I have done this before.
However, there is no clarity with Globe now as they still give different answers and from the recent changes in their price structure where phones and devices are not anymore subsidized by the company, one would wonder if the policy still holds. Even their rebates have gone drastically down from around 47% of the plan to just 20%.
When I terminated a recent plan, a 20% rebate was being offered in the condition that I get locked in for 24 months but I did not bite nor minded it as I just did not need it anymore.
Best is to get in touch with your account manager through the hotline and going to "Plan Renewal, Loyalty and Rewards" and ask straight from them. Be sure to get the name of the person you would be talking to in order to quote them on this.