Slower internet and poor service

The service is nothing short of appalling. I'm paying for a service I'm not receiving. For months the connectivity has been becoming slower and slower. Every time I call, I'm sent from pillar to post moving router around. Removing and reentering Sim with no change. I then upgraded the service but it's only gotten worse. I logged a ticket last week Monday and was told the matter would be attended to within 72 hours. Then I was later told that a technician will only come this coming Friday. Which means I need to wait almost 2 weeks to get assistance. In the meantime, I continue paying while incurring additional data costs and my family doesn't have access to wifi. Every time I call no one answers the phone and on WhatsApp it says all the agents are busy. How do I get supported?