Changed Payment Arrangment Made in Writing Without Consent

My payment arrangement (arranged with Xfinity agents for the 10th/11th of March) was changed today and my services disconnected despite my having the confirmation In Writing  of a payment arrangement set for the 10th/11th of March and that my services WOULD NOT be disconnected or disrupted by this arrangement. I download and screenshot all of my transcripts with Xfinity in the case that this happens. I have been gaslit by the company before. As this is in writing, it is a written contract. I would like my services Reinstated. I have been an Xfinity customer for years.