I was told my service time would be between 2-6pm....

I was told my service time would be between 2-6pm. I got a call at 12:30 stating I was next so would be there right at 2. I hurried home from work. At 4:30pm still no, so I called. I was told they would get a status and call back. At 5:30pm, I got a call back to tell me someone was on the way. At 6:30pm, a tech showed up. He took 2 hours, so I missed my 7pm meeting. After done, he pushed selling me a service plan. He explained that it included 2 pds of Freon for each of my air conditioners. He said that their hooking everything up and testing it uses 1 pd alone so good to have plan to add as needed since costs $100/pd. I asked if he tested it today, and he said yes all was good. I asked if he replaced the 1 pd he used up. He said no but if I bought the service plan he would add it next time. What??? Today's service was supposed to include up to 2 pds per unit. You use up a pd testing and don't replace and then want me to pay in advance for you to come later and replace it? I don't think so.
I told the tech that I didn't want to wait 8 hours from time I get a call to say I'm next to the time a tech completed. He said that if I buy a service plan there is a time guarantee. Time guarantee or discount for being late today? No.
He also said that the reps who call to give time estimates are young and new so they will learn how to estimate service times as they go on, so I should understand the time wait. He also said there isn't sufficient communication between the techs and call center. What I am hearing is that your call staff is undereducated, undertrained with a heavy roll over. That is not a legitimate excuse.
I politely said no thank you to the service plan. Paid the full amount and 8 hours later found out my AC is in fine working order with one less pd of Freon. Not impressed!