Disgusting customer service

I contacted cellc call centre because they have been over charging me every month. I call into the centre and the agent takes 2min before he asks me for my number. he authenticates me and stops there. such a long pause before he asks me whats my query. i give him my query and he just says nothing on the call. he put me on hold at one stage without notifyig me thereof. i didnt know what he was doing or if he was there. eventually he gets back to me and i ask him another question. he takes his sweet time assisting me. he clearly doesnt know how to end off a call either because he was just silent so i killed the call instead. absolutely disgusting as I have years of customer experience. Cellc needs to make a plan with communication towards customers as well as their network connection. just terrible. I thought cellc would be great as their costs are affordable. but its pointless when theres never any connection. so I would rather pay more for another network