Cybersmart service

Took out a Cybersmart fiber contract and since then have no internet!! Between Cybersmart and Frogfoot, they cannot sort this out. Frogfoot where onsite and according to them, the ONT and all settings are correct, Cybersmart sent a 2nd router and still I have the same issue. So no internet access since inception (3 weeks). What do I do now?! Cybersmart will hapilly bill me! Time to move to another ISP?