No phone line after order and deposit

Placed an order a few weeks ago for a phone line. Overlooked the fact that the consultant advised me I am able to get a 10mb dsl line and they changed my order to a 4mb capped line because I need the line. Contacted the call center and apparently everything can only be done by a person named Chantel Louber who doesn't answer calls and ignores emails. Where do i go from here after being asked to pay R750 deposits which are done