Telegram Google Play Payment Error Says I Already Own This Item

For some time now I have been experiencing a problem with my Telegram subscription process on my Android phone via Google Play. Since 5 September, whenever I try to pay the “one‑time SMS fee” on the Telegram login page, I get an error message on Google Play saying “Error: You already own this item” and the process does not continue, so I cannot complete the login or use the service properly. I contacted both Google Play and Telegram support about this problem, but so far I have not received any effective help and the issue still persists. I would like this payment and login problem to be investigated, the error to be removed and my access to Telegram to be restored without any additional cost to me. I kindly request that my issue be resolved as soon as possible and that I be informed in writing about the result.