It would appear from your story that if swift have raised the height of the door then only two things or either one of them has caused your problems.
1 the awningitself has been incorrectly fitted
2. you have been sold the wrong awning for the vehicle.try to refrain from getting to many opinions as they are all sure to differ,
May I recomend you contact a member on here, Peter at Johncross motorhomes See Add to right of screen or PM Peter direct as they are both Swift and Fiamma agents, I hope that is not who supplied you
Geo