An issue I've had forever is not knowing what to say and what tone my voice should be in when ending a phone call. Today for example, I rang ASDA because a parcel was supposed to have been delivered but wasn't. I got through the call normally and got the answers I needed but when it gets to the end, I'm lost! The woman told me what was going to happen and I had all my information and then I'm like "ok, thank you very much" and the woman paused and didn't really respond, then I started doing the thing where you end up talking at the same time and it's really awkward.
It happens to me all the time. I mustn't give off the right cues or I'm not reading theirs correctly. I'm not sure if it should be me saying goodbye or them 
Anyone know what I'm doing wrong?