Looks like a mandevilla, sometimes called dipladenia. The blooms are usually pink, red, or white. Yours is striped, so I think it's a fairly new variety called 'Stars and Stripes'. I don't think they're ever yellow....the man you talked to may have been thinking of an Allamanda, which is a different genus, but a vine in the same family. It also has five lobes to its flowers. People in my area (SW Indiana, zone 6) grow mandevilla as a summer annual, but lose them with the first hard frost. I don't know of them coming back after even an average winter. I'd keep it on a sunporch and not try to overwinter it outdoors since they are subtropical.

The vines are not spiky, it is not a Brazilian MG which I also have... And like Remy said, the Erowid MG are either I.tricolor or I. violacea with heart-shaped leaves that have smooth edges.. So it is none of those .. Just in case in matters, I received the seeds from my ex-neighbour who brought it back from South Africa.... Any other suggestions to what it might be ?

Looks a lot like a vine called Virginia Creeper, used in landscapes. Makes a very nice vine on walls or trellises. The leaves turn a beautiful red in the fall, then goes dormant for the winter. It grows an extensive root system and is very difficult to get rid of once well established. However, if you use some full strength glyphosate, not the ready-to-use mix but the stuff that is 40% or more active ingredient, you can use a cotton glove or paintbrush or sponge and coat new sprouts when they come out of the ground. This allows you to miss getting your holly by accident, and it will take the vine out but may need a couple applications as regrowth appears. The Roundup won't hurt the holly as long as you don't get any on the holly leaves even though their roots are close together. Your other alternative is to continue doing what you are doing now--keep cutting it off everytime some growth appears out of the ground to prevent any photosynthesis and gradually starve the roots out.

jean, I don't have a newly initiated post where I am the OP to check...it's been that kind of post the one hour rule refers to, not the responding to one of those posts. The responses and comments can be edited for a week, just not the original query. Oh wait, now that I've typed that I did have a post with a new subject line in Cooking from Friday. I just checked, no Edit option since I was the original - the originator of the subject ;)