Vumatel- poor customer service

Vumatel customer service is very bad, my installation was scheduled for the 13 Dec, then moved to the 18th, followed up with them today and they are telling me my installation is scheduled for the 24 Dec. I canceled my plans for the 13th and 18th because they say if they come to do installation and find no one in the property that order automatically goes to the bottom of the list. Every time i raise a concern, agents always say they will escalate the mater via email because they don't have direct contact with technicians, but they work for the same company.