Unsatisfactory services

Every month we are experiencing network issues and it seems like they are not investigating on the root cause so they can implement corrective measures to address our issue. This week we had 3 days of down service. I have been calling morning and evening still not sorted. Called before 7pm and consultant promised to call me back and no one called. This is ridiculous because we are using the wifi for work purposes. We might need to move to another service providers.