Carpet gripper on concrete was put down usually by a solution called PA5 which was a powder mixed with a resin which set solid,fitters now usually use gripperfix which comes in a tube a bit like no more nails ,the gripper is cut into short lengths about 6-8 inches long solution put on it ( hence the dabs of glue you mentioned )and stuck down for a stronger adhere.If the sub floor is very smooth screed as opose to rough concrete it will be more prone to pulling up of the floor as there is not as much for the resin to sink into and stick to .A fitter would need to put new gripper down in the same way ,unless he can pin it with concrete pins ( there is usually a reason though why it is stuck down ie pipes or solid floor ).The joins were heat seamed by the sound of it which is glue on a roll of paper like tape and a heat seaming iron is put over it to melt the adhesive ,and if the heat seaming iron is not hot enough or is pushed along the tape too quickly it can leave some parts of the tape unmelted .A fitter would need to re join the seams and to do this he would need to re heat the old tape to release it ,you cannot just pull it of as it can ruin the edge of the carpet and not rejoin correctly .Sorry Harry its not a five min job for a fitter if it is done properly .You could I suppose argue that the seams were not heated properly ,but it is a long shot because as stated by Hilton you should have checked the joins or got a disclaimer in the first place mate .Good luck
