Let's assume a Telco has terminated a consumer's lines without just cause. The disconnection is due to their failure of rectifying a billing issue. They didn't provide any customer support during the period of disconnection. More context is in an earlier post What's the consumer's rights in a Telco billing dispute?
If to proceed to a small claims court or relevant authorities, is there a need to provide documents or evidence to prove that the disconnections have adverse impact on the consumer or is it rightly understood that any terminations without just cause are unjust practices?