Poor customer service falling to make customers happy and sort out account payment issues

Morning Im here by write my review with a broken heavy heart as I have payed my vuma wifi using someone's account that I was assisting previously without noticing ....I have contacted Vuma as a company and spoke to the agent called Linda at past 4 via their WhatsApp portal....that person says sorry they can help me with my account since I pay to the wrong account that person has to give me money .....the person didn't bother to check which account I have payed 2 and how to sort it out cause im a customer there.....worse part they have to come with the solution cause the money has been deposited to Vuma as a big company and they have to do customers satisfaction and sort out my issue so that my account can be activated cause im sure the money I deposited went to their business account regardless the wrong account I payed for