Hi Manish (microscopesind),
I am sorry to hear about the neutral feedback and restrictions in your account. I know it is not a pleasant situation but I am sure your Account Manager will closely work with you to get the issues resolved. Most importantly, I will like you to know that we are here to work with you and help you out. You are as important for us as any eBay member.
To understand your issue better and hoping that I might be able to help, I checked the neutral feedbacks that you have received. One of the neutral is due to some shipping issue and seems to be a communication gap. However, I will not comment on the same since I do not have knowledge of the situation.
The other 3 neutrals you have received are all for the product - "NEW!! HAND TABLE MICROTOME w fixing clamp". Two of those neutrals complaint about the razor being not as described. You have not received a single positive for that particular product. This potentially means that the particular item has either product or communication issue.
It might be worth your while to investigate the reason for buyer dissatisfaction from the product. It may help to communicate with the buyer, offer them replacements, repair services as applicable. A response to a neutral "You can return the product if you dont like", it not a very buyer friendly approach.
Return Shipping: I looked up your item listings and saw that you mention clearly that buyer will bear the cost of return shipment. To me it almost sounds like you want the buyer to NOT ship the product back. If you were a buyer, will you feel excited about contacting the seller back to get the issue resolved? Possibly not!
If possible, arrange for the courier to pick up the product from the buyer's place. In my mind, a buyer will not mind paying for the shipping charges as long as he does not have to go through the hassle of finding a courier company. You are in the business and will possibly be able to help the buyer ship the product back at a cheaper cost.
If nothing else works out, at least the buyer will know that you tried your best because you care for him and the business he is giving you.
Please remember, a buyer is investing his time and money to buy from you on eBay because he needs the product and believes that you will give him good service. He needs to be assured of the same all the time (be it listing description or your buyer communication emails).
Hope the above helps!
Warm Regards,
Sapana