billing issues with promo

Signed up for promo 2yrs unlimited internet data at $55 per month July 2022. Router went out last summer and when went to store informed them am teleworker needing internet so plugged in personal router while getting issue resolved and the store told me that could use own router free of charge if would like, even after informed them that in past was told would incur a fee of $30 and they said that is no longer true. Well got notice that was hitting data limits so called customer service and was told that using own router could not be unlimited or would have to pay $30 each month, at that time informed them that was under 2 yr service agreement unlimited data $55 per month and that store told me could use own router, which customer service resolved by sending a router. Next got bill $104, called customer service and informed them of 2yr agreement doesn't end until July2024 and the response was that when used own router it negated the promo rate and they would fix it with me agreeing to new plan, when saw the texted rate on new plan offer informed them that wanted original terms of $55 per month until July 2024 as originally agreed, then was told agree to new terms and it would be amended to $55 per month and they would put in for refund of the difference from $104 and $55. Got refund notice emailed and then got 2nd email saying refund denied. Went to store and was told that would get a call from someone as they couldn't resolve due to promo no longer offered and that if they requested refund again it would just get denied again, was informed that would get a call to discuss, when got call was told that needed sign new agreement $65 or pay higher rate and the $55 promo is no more and not happening again and that agreed to higher rate plan which informed them was told that the plan would be amended after agreed to, the response was met with that they do not honor what was "spoken" and it did not mater what was told to me and was going to be held to agreed via text , even after reviewing bill history of past year and half were all $55 per month then interrupted with Oct 2023 charged $104 and after that month went back to $55 and then Jan 2024 was charged $79.44 but all the other months other than Oct and Jan are $55. Then was told had to make choice pay higher rate or agree to $65 and that was only options as they will not refund difference of the 2 bills over $55 and not reinstate the promo rate $55 even though every bill on the bottom showed promo rate lasts until July 2024. At that time informed the customer service representative that felt was being bullied into a plan since need service to remain gainfully employed as me and spouse both are full time teleworkers, needless to say agreed $65 per month but never before did agree to change plan from $55 promo that was supposed to remain in place until July 2024. Went to store to try get help and was told that need to contact corporate and had no email or way to contact other than a 24/7 customer service support number 800-266-2278 which called and it does not contact corporate office. Feel like Better Business Bureau needs to be made aware that Xfinity/Comcast are persuading customers by saying whatever they want to get customers to agree to plans with no recourse.