OK kind of vehicle without any choice

I purchased aveo uva LT last week,found good in terms of space & shape. The pickup & gear shift is very horrible. Vehicle vobbles like anything in 4th & 5th gear at 60/70 kms speed when vehicle slows slightly. I am feeling gearknob vibrating like anything in 4th gear onwards. Looks like same problem with other uva users, they are used to after some time. Very serious draw back.On top of that found dealer cheating customers like as what is mentioned in brochure as std fitment (Spoiler for LT) is not given to customers, very dissapointed. Even dealer was supported by OEM, very sad... OK kind of vehicle for high price.Spacious (as indicated in advt)Dull interior,hard transmission,low pickup