Disappointed client

I signed up with complexnet early 2020 on a basic WiFi plan and they were pretty great/professional and prompt with their resolve of connection issues or account disputes, which in effect made it very easy to recommend them to friends and family. It's only until the company began experience set backs in 2022 that their care for detail and the way they handled their loyal client base became disappointing to say the least . Enquiring about connection issues /maintenance/accounts took weeks if not months to resolve. Things went as bad as they're accounts being so out of order that I began to receive emails that I owed them close to a year of payments. The consultant was very direct and poignant and made it very difficult to deal with her as she demanded POp's dated back to 2022 ( all this while my WiFi was shut off for a month without an explanation as to why). I sent them all the pop's and cancelled my service immediately, this didn't stop them from contacting me months later to ask for the proof of payments once again with claims that I was owing them . The first half of our relationship was great , it's disappointing that in the latter years they neglected a loyal client base and treated them this way , not to mention a poor service delivery .