Disgusting service - From Managment and Agents

CSS contacted me and said I have an overdue account and it needs to be settled that was in Feb 2022.I requested proof of this amount outstanding in the same month and they never responded to me .Every month until 3 Aug 2022 I got treathing emails and messages from them but never the proof .When I contacted them their service was disgusting and terrible. If you're in a service whereby you interact with people please be attentive and make sure when you call or email you have all require info in place . Train your Agent correct CSS .