Accelerit....Customer Care Non Existent

This company doesn't even take Hello Peter seriously. I am serving my notice period, cancellation request sent through in November 2022. No invoice was generated for December 2022 after me logging numerous tickets and sending emails. Today my account is suspended due to non payment. Why is this my fault, when I'm begging to make payment and to abide by the termination period and rules. Since inception of me joining, I have not defaulted or missed any payments. Any action taken against me after the cancellation date will be vigorously defended. I have saved all the emails and tickets logged