I would like to answer this question. For anyone trying to buy reviews in general.
Disclaimer: The OP did not use our services.
There are two main reasons as to why a review may drops.
1. If the account used is bad
2. Trust Pilot updates it's system
But in this case there was a massive Trust pilot update which affected everyone irrespective of methods, quality etc. 99% of people(including me) who gamed the system were penalized.
Now who can be blamed here.
Imo TP changed the algorithm which no one has control over.
Now about your purchase, I genuinely feel bad you lost your money on the dropped reviews.
But my suggestion to anyone who is trying to purchase reviews/accounts must factor the cost of deletion/suspension. As there are updates beyond everyones control like in this case.
Any seller will have a warranty set to a specific period for which he/she must have already factored the cost in their selling price. Likewise any buyer must also factor the cost of drops to keep refilling over a period of time.
There are methods that may not have any drops such as creating a profile and simulating human activity. But at what volume, cost and selling price
This is just my honest 9 cents without beating around the bush. Though it's harsh, but a sad reality.
Regards