I have never experienced such horrendous customer service as I am currently with xfinity mobile

I switched our plan on Saturday, upgraded it to the 5G, went through the process and waited. Received the email it was successful and our plan has been upgraded. Went to site and it was still processing but within an hour , maybe 10 mins, account was upgraded and everything looked correct. We have 3 lines on 3 gig data at $30 and one unlimited line at $30. Then I get an email today with my current bill due from end of cycle and nothing is correct. The unlimited line is being billed at $45 and there is a $4.80 cent fee on the three phones we upgraded last month for text and talk services??? So I finally got someone who seemed friendly at first. Then proceeded to tell me I was incorrect in pricing and that the unlimited  line is $45. I proceeded to review the plan with him where it specifically states that with the upgraded plan by the gig and unlimited count towards the number of lines needed for the $30 unlimited line and read to him two areas it was referred to on the site. He was obviously angry and said something about the policy not being correct. But didn’t clarify. Then he proceeded to tell me that I did not upgrade our plan successfully. Funny, it was correct Saturday evening when I viewed our account and then if I want to switch the by the gig lines it is now $15 and not the $12 it was prior to upgrading our plan. So what [Edited: "Language"] is going on?? Talk Ann text is clearly stated as being included in the plans at no service charges! Then he became somewhat hostile with me and told me “if you upgraded it successfully you wouldn’t be calling me would you?” What?!! I am beyond livid at this point. I have had zero successful support sessions since initially having issue with one of our phones we upgraded getting lost in the mail. Had issue activating the phone and then finally got that resolved but the it stopped working the other night. Support was useless but whatever. The phone shows no balance on account or that there are 22 payments remaining so something isn’t correct. Tonight however, trying to resolve this billing issue, still not resolved and trying to tell me some of the crashes are coming from another part of xfinity and asking if have had issues with internet or residential service????? First of all, any charges there would be on my internet bill. I have never had support this rude, outright ignorant, and unable to actually take care of an obvious issue on xfinity’ end. Then during our call one of our lines that was by the gig was switched to unlimited, I have no idea how bc I didn’t do it, and when I told this rep he was like, “well, I don’t know how it happened.”. I just have no words left. If I need to end our service and get a full refund since we are out 14 days from upgrades I may have enough documentation of issues to get a legal support involved.