Vaillant AC Water Leak: Heating Drainage Installation Problem

Approximately two months ago, we had a Vaillant air conditioner purchased for our new workplace in Ataşehir, Istanbul, and it was installed by an authorized service provider. It already took several days for them to come and complete the installation. When we started using the air conditioner in heating mode during the winter, water began dripping from underneath the outdoor unit and leaking onto the ceiling of the business premises on the floor below, causing damage. Assuming that the drainage hose had not been connected, we opened a service request with Vaillant. When the service technicians arrived, they told us that the drainage connection had been installed for the water produced when the air conditioner operates in cooling mode, but no connection had been made for the water produced in heating mode, and that we would have to pay an additional fee for this. They also stated that otherwise, we would have to call a plumber and have it done ourselves, and left without carrying out any work. It is completely unacceptable, both technically and in terms of customer satisfaction, that a major company like Vaillant installs an air conditioner as if it were only intended to blow cold air and then attempts to charge extra for draining the water produced during the unit's normal operation in heating mode, treating it as an additional service. Currently, water continues to drip from underneath the outdoor unit every time we operate the air conditioner, creating problems for both the business below us and our own workplace. I request that Vaillant ensure the drainage system for water produced in heating mode is properly completed at no additional cost, that the installation be redone correctly if necessary, and that I be compensated for any damage or inconvenience caused by this issue. I expect this matter to be investigated urgently and a response to be provided as soon as possible.