Cannot Get A Response To A Simple Request

Absolute pathetic support. Trying to increase their sales by increasing my monthly spend limit via my Dashboard on their website. No luck. Phoned support and was promised a response within 48 hours. No luck again. Kept on phoning on a daily basis, but still no response. Every query was met with the same pathetic excuse, "We have escalated your complaint via email to our technical department". Upon querying why they could not get hold of their technical department via a telephone call, their response was that that was the only means of communication with their technical department. Really? In this day and age the only means of communication with your very own technical department is via email? It is not that I am asking them to provide a direct communication link to the moon for myself. I just want to increase my spend limit and thereby boost their sales. But they are not interested.