Billing not correct, no acknowledgement from Billing !!!

My services where due to non-payment from the 1st-12th December 2021, I paid on the 12th services where reconnected. I have since called rain to correct billing as per pro rata which they usually do. The billing department refuse to now admit the services where off , they say I may have had bad connection, which is not the case.... The call centre agents 2 I spoke can confirm on their side. I need my billing for December corrected .

Want infuriates me the billing Dept refuses to have a dialogue with me !!!