Xfinity Billing Issue and worse customer agent service

On 04-18-2025 around 5:30PM MDT - have contacted xfinity agent to reduce my xfinity internet bill , Agent was very nice at that time and he confirmed that i will be getting the service as $40/mo at 400mbps speed and the rate will stay for next 12 months and he shared the ticket as [Edit: Personal Information] for reference. 

After 10 days my bill was update to $69/mo for 400mbps plan which was not we agreed too.

On checking with the agent agian on 04-29-2025 they where keep on chaning the agent with out any resolution and wasted my 3.5hrs of time with out any lead.
and few agent and suopervior confirmed it was a misunderstanding from agent and they started suggesting plan with higher rates, which i have not requested for.

Reference chat from one of your xfinity agent - [Edit: Personal Information]

I need a proper response from xfinity when will the plan of $40/mo will be effected in my account?

If it was a wrong information from agent, xfinity needs to takecare of those thing before coming to an customer.
and customer cannot be affected on the misunderstanding and wasting our precious time for no use