Unprofessional tendencies - only after money

I do not recommend their services, after I requested to suspend my account, they went ahead and charged me regardless of the agreement made. There are emails to prove the agreement which they refuse to refer to and though our services are cut off they claim we are still using their service, but cannot prove all their claims. They cannot even show which months I was charged for, they have simply sent a round figure. I am very disappointed as they have acted unprofessionally. How do you bill a client who requested for services to be suspended, fail to investigate then impose payment which you cannot even reconcile? It seems they are just after money.