ATT/Direct TV not getting what I signed up for/being overcharged many Nationwide

I called ATT/Direct tv from a mailing ad to switch providers,customer service rep was very nice and accomidating.Told him what the ad read and made sure to get the channels and sevices I had with previous company,especially The Weather Channel which I watch quite often which on back of ad listed the channels included in the $89.99 package with High speed Internet and home phone.I also got a Tablet which was free with $10 a month charge.He told me there would be a $45 activation charge for tablet,but per add no installation charges for services....first bill would be approx $155 regular monthly bill would be $110 including fees and taxes. Got installed which took 8 hrs and still not right after another installer came out/no Weather Channel/called customer service and they were going to add higher tier no charge due to ad.Got first bill 1 mth later for 290.15....spoke to many customer reps ...got overcharged for phone and cable was more due to higher tier which was no advertised  as included,also charged and installation fee for internet which was also included at no charge per several ads.When I called customer service several times and spoke with Supervisor was told this is what I agreed to and if I cancel it would be over $400.nothing but problems since installed with service and billing.Worse than Spectrum which is pretty bad considering they were so nice when signing up.Would not suggest Direct TV or ATT to anyone,shame since my father worked there for 40 yrs.