Yes it happened to me. The doctor was unable to get a sufficient sample as I have fragile veins he tried my feet, hands, wrists etc. He said the same the DVLA would pass it - they didn't. after numerous calls I was told it had been returned and I had to wait. I was sent again for a medical to another Dr who did not have a long wait I have to say and I didn't have to pay. If possible when I called I would specifically ask if the sample was sufficient because I had to wait an extra 4 months. Luckily I didn't need my licence but if you do I would hassle and ask the name of the team they are on. Mind you it was just after Covid. It would be interesting to know where you saw the Dr, and if it's the same. He was pretty useless just wanted the money. S