Capabilty of service

Sent a mail to register for a programme with all the info required. After waiting several day, got feedback that I need to call with this info. Unavailable to help by email. In what day and age would a call centre prefer you to call them, also wasting airtime and previous working time (can't call after working hours). Please note that this is 2018 and this level of service is not appreciated by your clients - each interaction with your "service" centre takes me one step closer to your competitors.